Gryoki Bosastu opened the temple by the prayer of the imperial ordinance of the Emperor Shomu, and it was called Konkomyoji temple at that time, but after that Kobo Daishi visited the temple, named it Kosenji temple, and made it the third sacred place. The old tile in the tempyo, Fujiwara era was excavated at the precincts so it is imagined that the scale in those days was magnificant. Kameyama monk-emperor was pions, he helped to rebuild the temple and pagoda, and he named the title of the temple Kikozan. The majority of the building except Taishido were destroyed by fire of war by Motochika Chosogabe 10 in the Tensho era. The present building was rebuilt after that.

If you go through the verinilion colored the main gate of a Buddhist temple, and go forward to the precincts, the eight-sided shape of Kannondo appears on the right hand side, and there are the main temple at inner part of the front and Taishido on the right side of this side. There is "Koganei (a well) " by the side of Taishido, it is said that if one's own face is reflected in this well, he will to the age of ninety-two. There is "the stone of Benkei's strength" in the pond in the garden of this priest's residential quarters attached to a Buddhist temple. It is said that the stone was lifted by Benkei for the trial of his strength when he stopped at this place at the fight of the class of Genji and Heike 4 in the Juei era (1185). There is the grave which is said the Imperial mausoleum of the Emperor Chokei of Nancho at the bach of the main temple. While the Emperor Chokei staied at this temple, he was down by a illness and he died 5 in the Oei era. A stone monument was excavate under the grave, it was inscribed with "The inperior mausoleum he died 19 march 5 in Oei era. He was fifty-three years old.", so it was ascertained that it was a Imperial mausoleum.