Butterfly Greenhouse "Chō no sono", Ishikawa Prefectural Fureai Insect Museum (石川県ふれあい昆虫館 放蝶温室「チョウの園」)

The museum belongs to Ishikawa Prefecture, which entrusts its management to the Ishikawa Kenmin Fureai Kōsha foundation (石川県県民ふれあい公社) as designated manager. According to the page the prefecture devotes to the building in its series of public-architecture walks ("Kaga"), construction was completed in December 1997; Japanese Wikipedia and Wikidata give 22 July 1998 for the public opening.

The official Ishikawa tourism portal presents the institution as the first full-scale insect museum on the Sea of Japan coast, and Japanese Wikipedia calls its butterfly greenhouse the largest on that coast. The greenhouse marks the museum's calendar: a large illuminated tree about 4 m high, decorated with about 1,500 LEDs, is installed in it for Christmas, since at least 2016 according to a 2017 press release.

The museum also carries out scientific work. Since opening it has bred, to conserve it, the シャープゲンゴロウモドキ, a rare diving beetle of the prefecture listed as critically endangered (category IA) on the Ministry of the Environment's red list; from November 2019, with two other institutions, it was the first in Japan to breed and exhibit the Latvian diving beetle オウサマゲンゴロウモドキ, described as the world's largest diving beetle, obtaining the first emergence in the country in June 2020. A YouTube channel was opened in 2021, and in September 2026 the official site announced the discovery of two new subspecies of diving beetle in Japan.

The prefecture's page describes a steel-reinforced concrete building on two levels with a total floor area of 2,719.85 m². The exhibition and training spaces, arranged in two layers, surround the butterfly greenhouse (放蝶温室) on three sides, and the greenhouse opens onto a large atrium (吹き抜け). The route is designed so that visitors move through the inside and outside of the building, with contrasts of felt space: wide and narrow, light and dark, high and low, open and closed, movement and calm.

The exterior combines half-mirror glass and clear glass, so that the surrounding landscape and greenery are reflected in it. In a 2012 photograph published on Wikimedia Commons, the main façade shows wide glazed bands set on a concrete base, above a wide flight of steps. In the prefecture's official photograph of the greenhouse (captioned 「温室」), the planted atrium is covered at the top by glass panels in a grid frame and a white translucent veil, and large glazed bays open onto the upper floors.

The greenhouse reproduces a subtropical environment, "always summery" according to the official site, in which butterflies of southern regions, such as Okinawa, fly freely. The official site announces about 10 species and some 1,000 individuals all year, and names ten: オオゴマダラ, presented as Japan's largest butterfly, リュウキュウアサギマダラ, シロオビアゲハ (one form of which mimics a toxic butterfly), クロアゲハ, モンキアゲハ, クロテンシロチョウ, キチョウ, カバタテハ, ナミアゲハ and スジグロカバマダラ. The English version of the site speaks of flowers in full bloom.

The official site mentions feeding stations where the オオゴマダラ settle. Outside the greenhouse, the museum shows about 1,600 species of specimens according to Japanese Wikipedia, an observation section of live insects of about twenty species (Hercules beetles, leaf insects and diving beetles, according to the English official site), the "むしむしハウス", dioramas and an outdoor biotope, the Midori pond, where about forty insect species have been recorded.

The museum is in Hakusan, about a 20-minute walk from Tsurugi station (Hokuriku Railroad, Ishikawa Line). The author of a blog on the Ishikawa tourism portal suggests allowing 30 to 60 more minutes for the outdoor biotope. It is very hot there in summer.

The same portal offers an electric-bicycle route starting from Tsurugi on which the museum is the second stop, before the Shishiku plateau (Sky Shishiku, at 650 m, with a view over the Tedori plain) and the Shirayamahime shrine. A family café, "Haruru. GOHAN to ASOBI", is about two minutes away by car, according to the blog. The closing days (Tuesdays, with exceptions, and the year-end) are best checked on the official site.