長興寺, Buddhist temple in Tahara, Japan.

Chokoiji is a Zen Buddhist temple in Tahara with multiple structures including a main hall, bell tower, and gates set among maple trees. The buildings are arranged across the grounds in a way that separates different functional areas for worship and daily activities.

Founded in 1275 by vow of Retired Emperor Go-Fukakusa as Daikakuji, a Tendai temple, it later became Rinzai and declined amid Muromachi warfare. In 1482 Toda Munemitsu, lord of Tahara Castle, had his adopted son's chaplain Shunko Esei revive it as a Soto Zen temple renamed Chokoiji, granting 50 kan of temple land as the Toda family's burial temple.

The temple serves as a sacred space for devotion to Kannon, a Buddhist deity of compassion, and its layout reflects how such sites function as places for prayer and reflection in the local community. The seasonal changes in the gardens shape how people visit and use the grounds throughout the year.

The temple is accessible by bus from Mikawa-Tahara Station on the Toyohashi Railway Atsumi Line heading toward the Okubo district. Once in the area, the site is walkable and can be reached on foot from nearby bus stops.

The grounds hold the burial site of the Toda clan family graves, arranged in a row facing south along the western side of the complex. This arrangement reveals how secular families maintained strong ties to the temple.