Provided is a resin composition containing: cellulose acylate (A); at least a polymer (B) selected from a group consisting of: a polymer (b1) having a core-shell structure including a core layer containing a butadiene polymer, and a shell layer located on an surface of the core layer and containing a polymer selected from a styrene polymer and an acrylonitrile-styrene polymer; a styrene-ethylene-butadiene-styrene copolymer (b2); polyurethane (b3); and aromatic polyester (b4); and a plasticizer (C). A resin molded article obtained by molding the resin composition satisfies at least one of the following conditions (1) and (2): (1) a heat distortion temperature measured in accordance with an ASTM D648-07 B method is 95° C. or less; and (2) a heat distortion temperature measured in accordance with an ISO 75-2 A method (2013) is 80° C. or less.