A cellulosic resin film which is wide and, despite this, is extremely reduced in breakage during a stretching step; a process for producing the film; and an antireflection film, a polarizer, and a liquid-crystal display each comprising or employing the film. The process for cellulosic resin film production comprises casting a liquid cellulosic resin on a support to form a web, peeling the web from the support, subsequently drying the web in a first edge gripping step (105) while gripping both edges, temporarily eliminating the edge gripping, and then stretching both edges in the width direction in a second edge gripping step (109). The process is characterized in that the first edge gripping step is followed by a heat treatment step in which both edge parts of the web relieved from the edge gripping are heated with heating rolls (107 and 108).