This paper shows that mountain worship contributed to city formation in medieval Hiraizumi, using some indices of buildings and roads extension axis.
As a result, the concentration of buildings and roads axis to two mountains -Kannonyama and Rambaisan- was found, where important shrine designated by the Imperial Court formation exist.
The fact suggests a possibility that mountain worship of Japan ancient times also contributed to construction of main facilities and city-formation in medieval Hiraizumi, as well as the belief of Ohshu Fujiwara Family to Buddhism.
