Kamei-in, Buddhist temple in Mama, Japan

Kamei-in is a Nichiren Buddhist temple in the Mama district of Ichikawa, Chiba Prefecture, and a sub-temple of nearby Guhō-ji. Its grounds contain a well linked by legend to Tekona of Mama, who is said to have drawn water here daily; reeds around the well are said to grow with leaves on one side only so as not to injure her. A hall dedicated to Tekona stands across the street to the south.

Kamei-in was built around 1635 as a retirement temple for the 11th abbot of nearby Guhō-ji, and it remains a sub-temple of that temple. Originally called Bin'i-bō, it was renamed Suzuki-in after the burial of the Guhō-ji patron Suzuki Nagatsune, and later received its present name. In 1705 the Tokugawa administrator Suzuki Nagayori restored the temple using stones from Nikkō Tōshō-gū for its steps; a popular story says he was forced to commit seppuku for this, but the inscription on his bone container found in 1960 records that he died of illness.

The temple's name combines the characters for turtle (亀) and well (井), linked to a legend of a mysterious turtle appearing at the site. The Mama Well in the grounds is associated with Tekona, who according to legend drew water here daily; the reeds around the well are said to have grown single-sided so as not to injure her. The well is commemorated in a Man'yōshū poem by Takahashi Mushimaro.

Kamei-in stands in the Mama district of Ichikawa, southeast of Guhō-ji and across the road from the Tekona Reijin-dō hall. The Keisei Main Line's Kōnodai Station is a short walk away. The temple grounds are small and explored on foot; the Mama Well lies within them.

The well in the grounds is linked to Tekona of Mama, who according to legend drew water here daily; reeds around it are said to have grown single-leaved so as not to cut her. The Nara-period poet Takahashi Mushimaro wrote a Man'yōshū verse about seeing the Mama well and remembering her.