disclosed is a resin molded body which is good in fillability of the resin and releasability of the molded body , while enabling to form micro recesses and projections having a size from hundreds nm to hundreds μm with high precision . this resin molded body is characterized by comprising a micro three - dimensional shape portion having a width a , a height b and a length c , with a being not less than 5 μm and not more than 100 μm , b / a being not less than 1 and not more than 10 and c / a being not less than 0 . 5 and not more than 1 . 5 . the resin molded body is also characterized in that it is formed by injection molding using a thermoplastic resin having a flexural modulus of not less than 100 mpa and not more than 1500 mpa .