Many reinforced concrete school buildings in Kure City suffered contact or collision damage of expansion joint during the 2001 Geiyo Earthquake. With a purpose of finding the appropriate clearance of expansion joint for reinforced concrete building, the clearances of expansion joint for the school buildings which suffered collision damage during the 2001 Geiyo Earthquake were investigated. From the clearances of expansion joint which suffered damage, the deformation of reinforced concrete building subjected earthquake is examined.