Chinpokan Museum (Fertility Folk Artifact Museum)

The founding date and founder of Chinpoukan have not been confirmed through primary sources. Several tourism sites describe the collection as comprising 'folk artifacts related to phallic worship approximately 100 years old' (Tabiinfo), but no official founding year or establishment history is available through the official site (chinpoukan.com) or verified secondary sources (information uncertain). The facility name 'Chinpoukan' (珍宝館) can be read either as a Buddhist term meaning 'hall of precious rarities,' or as a pun with vulgar anatomical connotations — the ambiguity appears deliberate. The centerpiece of the garden is a pair of natural rocks called 'Meotoiwa' (husband-and-wife rocks), connecting the site to a widespread Japanese tradition of enshrining naturally phallic or vulvic stones at shrines. The facility is confirmed as currently operating by both NAVITIME (NAVITIME) and multiple Gunma tourism sites (Danbe.com).

Phallic and yonic folk artifacts held by shrines and temples across Japan are physical evidence of fertility prayers, good-harvest rites, matchmaking, and childbirth prayers deeply embedded in Japan's agrarian society. While some, like the annual Honen-sai festival at Tagata Shrine in Aichi Prefecture, remain active religious ceremonies, others have been preserved in private collections and museums. Chinpoukan belongs to the latter category — the artifacts are displayed outside an active ritual context, but their original folk-religious significance as vessels of prayers for abundance and procreation remains inherent in the objects. The inclusion of sexually expressive folk art from other world cultures situates phallic worship as a universal human phenomenon rather than a peculiarly Japanese one.

Chinpoukan is not listed on Yoshioka Town's official tourism page, but it is featured as a local landmark on multiple Gunma B-grade spot websites (B-Gunma). Its location a few kilometers from the Shibukawa-Ikaho IC has made it a regular stop for Ikaho Onsen tourists from the greater Tokyo area, including both individual travelers and bus tours. The museum's reputation rests substantially on the lively commentary provided by the attendant on duty.

Open year-round. Weekends are better if you want to hear the live commentary from the museum guide (the guide may be absent on weekdays). Pairing the visit with Ikaho Onsen makes for a natural day trip from Tokyo.

Outdoor exhibits including the Meotoiwa rocks can be photographed freely. For indoor exhibits, follow the guidance of staff. If you wish to photograph the commentary session, obtain permission in advance.

As the exhibits include objects with religious and folk-cultural significance, visitors are encouraged to approach them with the same respectfulness one would bring to a folk museum. The sexually explicit nature of many exhibits means accompanying minors requires parental judgment.