|Main Hall of IIyama Kannon|
|Mountain Name||Iigamisan (飯上山)|
Hase-dera, or Chōkoku-ji (長谷寺) is a Shingon sect Buddhist temple located outside of Atsugi, Kanagawa Prefecture, Japan. It is more popularly known as the Iiyama Kannon (飯山観音), after its primary object of worship.
According to temple legend, Hase-dera was founded by either the wandering holy ascetic Gyōki around 725 AD, or the famed prelate Kūkai from 810-835 AD. However, no historical documents have survived to substantiate this legend, and the history of the temple is thus uncertain. During the Kamakura period, the temple was a center for ecumenical studies linking the Shingon sect with the Tendai, Ritsu and Zen sects, along with Kakuon-ji in Kamakura and Shōmyo-ji in Mutsuura. At present, the temple belongs to the Kōyasan Shingon sect of Japanese Buddhism.