1. A road surface condition detecting apparatus mounted on a vehicle comprising; laser beam scanning means for scanning a laser beam in a transverse direction of the road surface; image pick-up means for picking up locus of a scanning of said laser beam in an inclined direction for producing transverse profile data of the road surface; light receiving means for receiving a laser beam reflected from said road surface in an inclined direction for producing crack data of said road surface; road distance detecting means for measuring distances to said road surface from three positions on a line in the longitudinal direction of said vehicle for producing longitudinal profile data of said road surface; running distance detecting means for measuring a running distance of said vehicle; and recording means for recording data respectively produced by said image pick-up means, said light receiving means and said distance detecting means together with the running distance data produced by said running distance detecting means.