Oiso Shiroyama Park (Kanagawa Prefecture) Complete Guide: Thorough Explanation of the Charm of the Former Mitsui Villa and Former Yoshida Shigeru Residence
Oiso Shiroyama Park, located in Oiso Town, Naka District, Kanagawa Prefecture, is a prefectural urban park with high historical value deeply connected to modern Japanese history. Developed utilizing two precious historical legacies—the former villa site of the Mitsui zaibatsu main family and the former residence of Yoshida Shigeru, the former Prime Minister who led Japan’s postwar reconstruction and spent his later years here—this park is cherished by many people as a cultural and tourism landmark representative of the Shonan region.
Overview of Oiso Shiroyama Park
Oiso Shiroyama Park is an urban park (scenic park) managed by Kanagawa Prefecture, consisting of two districts: the Former Mitsui Villa District (approximately 7 hectares) and the Former Yoshida Shigeru Residence District (approximately 3 hectares). While each district is within walking distance of the other, they possess different historical backgrounds and characteristics, offering diverse experiences to visitors.
The park’s designated manager is the public interest incorporated foundation Kanagawa Park Association, which works in coordination with the Hiratsuka Civil Engineering Office to ensure appropriate maintenance and event planning. Located in Nishi-Koiso and Kofuhongo, Oiso Town, Naka District, Kanagawa Prefecture, the park sits on a high area overlooking Sagami Bay, and on clear days, it is known as a scenic spot from which one can see all the way to Mt. Fuji and the Izu Peninsula.
Charm and Highlights of the Former Mitsui Villa District
Historical Background
The Former Mitsui Villa District was used as a villa for the Mitsui zaibatsu main family from the Meiji era through the early Showa period. The Mitsui family, a representative zaibatsu of Meiji-period Japan, constructed a vast villa on this picturesque land in Oiso. After the war, the land was transferred to Kanagawa Prefecture, and systematic development as a park has proceeded in stages since 1967 (Showa 42).
Fudo Pond and Japanese Garden
The central highlight of the Former Mitsui Villa District is the beautiful Fudo Pond at the center of a Japanese garden. Around the pond, various grasses and flowers are planted according to the seasons—cherry blossoms in spring, azaleas in early summer, and autumn leaves in fall—offering different scenery for each season. Koi swim in the pond, and the appearance of trees reflected on the water’s surface enhances the atmosphere of the Japanese garden.
Tea House “Shiroyama-an”
Within the park stands a full-fledged tea house called Shiroyama-an, which is open to tea ceremony enthusiasts and those wishing to experience Japanese culture. Regular tea ceremonies are held at Shiroyama-an, providing a valuable opportunity to experience traditional Japanese culture. From the tea house, one can enjoy beautiful views of the garden, and the experience of enjoying a cup of tea in the quiet atmosphere allows visitors to forget the hustle and bustle of daily life.
Panoramic View from the Observation Deck
An observation deck is set up on the high ground of the Former Mitsui Villa District, offering a panoramic view of Sagami Bay. On days with good weather, one can see all the way to Enoshima, the mountains of Hakone, and Mt. Fuji. The view at dusk is particularly breathtaking. This observation deck has become a popular spot for photography enthusiasts and tourists.
Characteristics of the Former Yoshida Shigeru Residence District
Yoshida Shigeru and Oiso
The Former Yoshida Shigeru Residence District is the site of the former residence where Yoshida Shigeru, who served as Prime Minister of Japan five times during Japan’s postwar reconstruction period, spent his later years from the 1940s onward. Yoshida cherished Oiso dearly, and made many important political decisions at this location. The term “Oiso pilgrimage” was coined such that many politicians and business leaders would visit this residence to discuss Japan’s postwar direction.
Restoration of the Former Yoshida Shigeru Residence
Unfortunately, the Yoshida Shigeru residence building was destroyed in a fire in 2009 (Heisei 21), but in April 2017 (Heisei 29), a building faithfully reconstructing its original appearance was restored. The reconstructed residence is a building that embodies the finest modern Japanese-style architecture of the early Showa period, with the study, reception rooms, and other spaces that Yoshida Shigeru actually used recreated in their original state.
Kabuto Gate and Shichiken Hall
At the entrance to the Former Yoshida Shigeru Residence District stands an impressive Kabuto Gate (helmet gate). This gate reflects Yoshida Shigeru’s taste and aesthetic sensibilities with its distinctive design, greeting visitors. Also located on the grounds is Shichiken Hall, a building that houses bronze statues of seven Meiji-era statesmen whom Yoshida Shigeru admired. These facilities serve as valuable materials for understanding Yoshida Shigeru’s character and philosophy.
Rose Garden
The Former Yoshida Shigeru Residence District features a beautiful rose garden, where approximately 100 varieties of roses bloom in spring and autumn. Since Yoshida Shigeru himself was fond of roses, this rose garden was designed as a space to recall his interests. The garden draws many visitors during May and October, when the roses are in bloom.
Oiso Town Local History Museum and Kita-Gura Gallery
Within the Former Yoshida Shigeru Residence District is the Oiso Town Local History Museum, which displays precious materials related to Oiso’s history and culture and Yoshida Shigeru. The Kita-Gura Gallery hosts special and featured exhibitions on a regular basis, serving as a base for local arts and culture promotion. These facilities transform a park visit into a deeper learning opportunity.
Historical Legacies and Cultural Properties
The land of Oiso Shiroyama Park is a place where people have lived since ancient times and is an archaeologically important region. During park development, many cultural heritage items were excavated, including Jomon-period pottery, Kofun-period horizontal-entrance tombs, and medieval roads from the Kamakura period.
Particularly noteworthy is the ruins of Koiso Castle, which was built during the Muromachi period. This castle played an important role as a strategic stronghold in Sagami Province. Castle remains are still preserved within the park today, making it an interesting exploration spot for history enthusiasts.
Seasonal Appeal
Spring (March–May)
Oiso Shiroyama Park in spring is known as a famous spot for cherry blossoms and azaleas. From late March to early April, Somei Yoshino and Yamakura cherry blossoms bloom in full splendor, drawing flower-viewing crowds. Mid-April onward, azaleas come into bloom, adding vibrant color to the park. In May, the rose garden reaches its peak, enchanting visitors with fragrant flowers.
Summer (June–August)
During the rainy season, hydrangeas color the park. Summer features beautiful new greenery, allowing visitors to enjoy walks in the shade and cool off. The sea breeze from Sagami Bay is pleasant, and it is a place to fully experience a Shonan summer.
Autumn (September–November)
Autumn is the season of fall colors. From mid to late November, Japanese maples and ginkgo trees turn color, transforming the Japanese garden into autumn foliage scenery. Additionally, autumn roses bloom, and visitors can enjoy flowers in calmer autumn tones different from spring.
Winter (December–February)
The winter park is enveloped in silence, allowing visitors to enjoy walks in a crisp, clear atmosphere. On clear days, Mt. Fuji is distinctly visible, allowing visitors to savor winter’s unique scenery. February, when plum blossoms signal early spring, is a time when visitors can feel the approach of spring.
Event Information
Throughout the year, various events are held at Oiso Shiroyama Park. A diverse array of programs is offered, including tea ceremonies, photography exhibitions, nature observation sessions, and history lectures, allowing visitors to experience the park’s appeal more deeply.
Particularly popular are “Rose Festa” timed with spring and autumn rose garden blooms and “Autumn Foliage Illumination” during the fall colors season. Additionally, special events are sometimes held on Yoshida Shigeru’s birthday or death anniversary.
For the latest event information, please check the park’s official website or information from the Kanagawa Park Association, the designated manager.
Access Methods
Using Public Transportation
Access to the Former Mitsui Villa District:
- Approximately 15 minutes walk from JR Tokaido Main Line “Oiso Station”
- Take Kanagawa Chuo Bus from Oiso Station toward “Ninomiya Station South Exit” or “Shonan Oiso Housing,” and get off at “Shiroyama Park Mae” (right in front)
Access to the Former Yoshida Shigeru Residence District:
- Approximately 25 minutes walk from JR Tokaido Main Line “Oiso Station”
- Take Kanagawa Chuo Bus from Oiso Station toward “Ninomiya Station South Exit,” and get off at “Shiroyama Park Mae,” then approximately 5 minutes walk
Access by Automobile
- Approximately 30 minutes from “Atsugi IC” on the Tomei Expressway
- Approximately 10 minutes from “Oiso IC” on the Odawara-Atsugi Road
- Approximately 5 minutes from “Oiso West IC” on the Nishi-Shonan Bypass
Parking Information
Dedicated parking lots are provided at the park.
Former Mitsui Villa District Parking Lot:
- Regular vehicles: Approximately 30 spaces
- Operating hours: 8:30–17:00
- Fee: Free (may be charged during events)
Former Yoshida Shigeru Residence District Parking Lot:
- Regular vehicles: Approximately 50 spaces
- Operating hours: 9:00–17:00
- Fee: Free on weekdays, charged on weekends and holidays (300 yen per visit)
※Parking lot congestion and fees may change; please check the official website for the latest information before your visit.
Usage Information
Hours of Operation
- Former Mitsui Villa District: 8:30–17:00 (open year-round)
- Former Yoshida Shigeru Residence District: 9:00–17:00 (closed Mondays; if Monday is a holiday, closed the following weekday)
Admission
- Former Mitsui Villa District: Free
- Former Yoshida Shigeru Residence District: 500 yen for adults (high school students and above), free for middle school students and below
- 400 yen for groups of 20 or more
- Free for seniors 65 and above with proof of age
- Free for those with disability certificates and one caregiver
Facility Usage
If you wish to use the tea house “Shiroyama-an,” advance reservation is required. For usage fees and reservation methods, please contact the park management office.
Nearby Tourist Spots
When visiting Oiso Shiroyama Park, we recommend also visiting nearby tourist attractions.
Oiso Beach
Known as Japan’s first public beach, Oiso Beach is within walking distance of the park. During summer, it is crowded with swimmers and bathers, making it a place to fully enjoy the Shonan sea.
Former Shimaki Tojin Residence
The residence where the celebrated author Shimaki Tojin spent his later years is preserved and is a must-see spot for literature fans.
Oiso Prince Hotel
A resort hotel overlooking Sagami Bay, where guests can enjoy hot springs and restaurants. It is also ideal as a place to rest after walking through the park.
Shigitatsuan
Known as one of Japan’s three major haiku halls, Shigitatsuan is a sacred site for haiku enthusiasts. Visitors can immerse themselves in the world of haiku in a quiet garden.
Photography Spots
Oiso Shiroyama Park is filled with subjects appealing to photography enthusiasts.
- Autumn leaves reflected on Fudo Pond’s surface: A classic autumn photography spot
- Mt. Fuji and Sagami Bay from the observation deck: Best early morning or at sunset
- The Kabuto Gate of the former Yoshida Shigeru residence: A composition with historical gravitas
- Blooming roses in the rose garden: Also ideal for macro photography
- Tea house Shiroyama-an and Japanese garden: Perfect for capturing Japanese aesthetics
When photographing, please be considerate of other visitors, and if using a tripod, it is recommended to confirm with the management office beforehand.
Accompanying Pets
Pets are allowed at Oiso Shiroyama Park. However, the following rules must be observed.
- Leashes must be worn at all times and held short
- Waste must be taken with you
- Pets are not allowed inside buildings
- Do not disturb other visitors
Many visitors enjoy walking their dogs in the park, making it a popular place to enjoy nature with pets.
Barrier-Free Information
Oiso Shiroyama Park is working to become more accessible so that everyone can use it comfortably.
- Accessible restrooms: Located in each district
- Wheelchair rentals: Available at the management office (advance notice required)
- Ramps: Installed on major park paths
- Braille signage: Installed at major facilities
However, some park paths are inclined, so it is recommended that wheelchair users be accompanied by an assistant.
Park Usage Etiquette and Requests
To maintain the beautiful park and ensure all visitors can enjoy it comfortably, please observe the following:
- Always take trash with you
- Harvesting plants or feeding animals is prohibited
- Smoking is prohibited outside designated areas
- Be considerate so as not to disturb other visitors with loud voices or noise
- Bicycles, skateboards, and similar devices are not permitted
- Drone flights are prohibited
Contact Information
Oiso Shiroyama Park Management Office
- Address: 83 Nishi-Koiso, Oiso Town, Naka District, Kanagawa Prefecture 255-0005
- Phone: 0463-61-0355
- Manager: Public Interest Incorporated Foundation Kanagawa Park Association
Hiratsuka Civil Engineering Office
- Phone: 0463-22-2711 (Main)
Conclusion
Oiso Shiroyama Park is a representative cultural park of Kanagawa Prefecture, developed utilizing two historical legacies—the Former Mitsui Villa District and the Former Yoshida Shigeru Residence District. With abundant attractions including a beautiful Japanese garden, the tea house Shiroyama-an, the restored Yoshida Shigeru residence, and a colorful rose garden, the park offers different charm throughout the four seasons.
This park is a precious space that harmonizes scenic vistas overlooking Sagami Bay, rich nature, and deep history, and can be enjoyed for diverse purposes including tourism, walks, history study, and cultural experiences. With good accessibility and proximity to Oiso Station, it is a must-visit spot when touring the Shonan area.
Why not take a slow walk through the park, ponder the history of Japan from the Meiji through Showa periods, and spend peaceful moments in this space where beautiful nature and cultural heritage are in harmony?
