A method for producing a light-modulating film in which a light-modulating layer is sandwiched between two transparent electroconductive resin substrates, the light-modulating layer being formed by use of a light-modulating material containing: a polymeric medium for forming a resin matrix, and droplets of a light-modulating suspension dispersed in the polymeric medium, wherein the light-modulating suspension is a substance wherein light-modulating particles are dispersed in a dispersing medium in the state that the particles can flow, and the light-modulating particles are polyperiodides, the method comprising the step of: the step (a) of applying the light-modulating material to a first transparent resin substrate of the transparent electroconductive resin substrates; and characterized in that it further comprises: the step (b) of bonding a second transparent resin substrate of the transparent electroconductive resin substrates onto the light-modulating material applied to the first transparent resin substrate; and the step (c) of irradiating the light-modulating material sandwiched between the first transparent resin substrate and the second transparent resin substrate with an energy ray to cure the polymeric medium for forming the resin matrix contained in the light-modulating material, thereby forming the light-modulating layer to yield the light-modulating film; wherein the workpiece formed of the first transparent resin substrate, the second transparent resin substrate and light-modulating material, is pressed from either the first transparent resin substrate side thereof or from the second transparent resin substrate side thereof in the step (b). the step (a) of applying the light-modulating material to a first transparent resin substrate of the transparent electroconductive resin substrates; and characterized in that it further comprises: the step (b) of bonding a second transparent resin substrate of the transparent electroconductive resin substrates onto the light-modulating material applied to the first transparent resin substrate; and the step (c) of irradiating the light-modulating material sandwiched between the first transparent resin substrate and the second transparent resin substrate with an energy ray to cure the polymeric medium for forming the resin matrix contained in the light-modulating material, thereby forming the light-modulating layer to yield the light-modulating film; wherein the workpiece formed of the first transparent resin substrate, the second transparent resin substrate and light-modulating material, is pressed from either the first transparent resin substrate side thereof or from the second transparent resin substrate side thereof in the step (b). the step (b) of bonding a second transparent resin substrate of the transparent electroconductive resin substrates onto the light-modulating material applied to the first transparent resin substrate; and the step (c) of irradiating the light-modulating material sandwiched between the first transparent resin substrate and the second transparent resin substrate with an energy ray to cure the polymeric medium for forming the resin matrix contained in the light-modulating material, thereby forming the light-modulating layer to yield the light-modulating film; wherein the workpiece formed of the first transparent resin substrate, the second transparent resin substrate and light-modulating material, is pressed from either the first transparent resin substrate side thereof or from the second transparent resin substrate side thereof in the step (b).