The photochemical behavior of two kinds of side-chain type azobenzene-polymers, poly[2-(2-methacryloyloxyethoxy)-4-methoxyazobenzene] (pMAzS2) and poly[4-(2-methacryloyloxyethoxy)azobenzene] (pMAz2), was investigated in order to obtain information about effect of molecular structures on photoreorientation process. Irradiation of polymer films with linearly polarized visible light (488 nm) brought about reorientation of azobenzene moieties. Trans isomers in both polymers were aligned in the perpendicular direction to the electric vector of the actinic polarized light.