It is said that he was born at a corner of Hogon-ji Temple located in the deep valley of Dogo-onsen Hot Spring in Matsuyama City, Ehime Prefecture, and a stone monument which is inscribed 'Ippen Shonin Birthplace Site' was built there in 1334 by Michitsuna TOKUNO who had come from the same family.
生まれたのは愛媛県松山市道後温泉の奥谷である宝厳寺の一角といわれ、元弘4年（1334年）に同族得能通綱によって「一遍上人御誕生舊跡」の石碑が建てられている。