January 18, 2022

Toshimaen is an amusement park that once existed in Koyama 3-chome, Nerima-ku, Tokyo. It was operated by Toshimaen Co., Ltd. (currently Seibuen Yuenchi Co., Ltd.), which belongs to the Seibu Group. It has been in business for 94 years since 1926 and closed on August 31, 2020. Horror movies set in the main garden are also described in this section.


It was adjacent to the northwest of Toshimaen Station on the Seibu Toshima Line. It was landscaped around the ruins of Nerima Castle, which was built during the Muromachi period. The name comes from Mr. Toshima, who built and ruled the castle. It is often misunderstood from the name of the garden, but it was not located in Toshima Ward or Toshima Ward in Kita Ward, but in Koyama 3-chome, Nerima Ward. However, the place name at the time when Toshimaen was opened was Kaminerima-mura, Kita-Toshima-gun, Tokyo. The owner was Seibu Railway, which outsourced business to Toshimaen Co., Ltd. One of the oldest amusement parks in Japan, it is also one of the largest amusement parks in the Tokyo metropolitan area, and has various amusement facilities, as well as many Yoshino cherry trees in spring, hydrangea flowers in early summer, and many pools in summer. It was an urban oasis visited by local residents. There were many event plans such as holding cosplay events. The ground of the annex was used for sports festivals of companies and schools, and was also a community-based amusement park. As it was called "water and green amusement park", there were facilities in the park where you could interact with water and nature. There is also a vast outdoor pool area, which was used as a pool in the summer and as a fishing pond in the winter. In the pool area, in addition to the world's first flowing pool and wave pool, there was also Japan's first and largest advanced waterslide called HYDROPOLIS. As a local rule, people with tattoos including stickers were prohibited from entering. It is officially stated that the closure of Toshimaen is to respond to the request from the Tokyo Metropolitan Government to close the park due to the city planning to make it a disaster prevention park, not the reason for deterioration of management or aging facilities. In recent years, the number of visitors has been increasing, and investment such as renovation and introduction of new facilities was made until just before the park closed. In 1957, the city plan of Tokyo to develop Toshimaen as Nerima Castle Ruins Park was designated. After that, the talk did not proceed due to the opposition of the local residents, but in order to make use of the lessons learned from the Great East Japan Earthquake in 2011, Tokyo will create a vast park as an evacuation area, so the then governor Shintaro Ishihara will play a central role. Then, we started a more concrete disaster prevention park plan, and started negotiations for land acquisition and closure with Seibu Railway. After that, the plan stagnated again, but in 2019 Warner Brothers joined the negotiations, a plan to build a theme park for the Harry Potter series emerged for Seibu Railway, and a request for land acquisition and closure from Tokyo. Since the deadline for responding was 2020, it was officially decided to close the park at the end of August of the same year on June 12, 2020. Amid the epidemic of the new coronavirus infection (COVID-19), admission to both the amusement park and the pool began to be restricted from July 13, 2020, and the park was closed on August 31 of the same year. Toys "R" Us, which was open on the adjacent site, also closed on the same day. The attached hot spring facility "Niwanoyu" will continue to be open even after Toshimaen is closed.



On the south side of the Shakujii River, near the waterslide "Hydropolis" was once called Yanoyama, and there was Nerima Castle built by Mr. Toshima during the Muromachi period. The castle reappears on the site that was abandoned after losing the battle with Ota Dokan.

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