Amida worship was first introduced into Japan during the Nara period and mixed together with Miroku Bosatsu (Buddha of the Future, Bodhisattva of the Present) belief as ancestral worship.
日本には奈良時代に伝わり、先祖敬仰としての阿弥陀信仰が弥勒菩薩信仰と混交してなされていた。