A composition for forming thermoset film cured by being heated in which optical anisotropy is induced by being irradiated with linear polarized light, comprising: a component that is a compound having a photo-aligning group and a hydroxy group; and a component that is a silicon isocyanate compound, wherein the component is a compound of formulae: in which X 1 is a single bond or is C 1-18 alkylene, phenylene, biphenylene, or cyclohexylene bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond, wherein the C 1-18 alkylene, the phenylene, and the biphenylene are optionally substituted with one or more substituent(s) the same as or different from each other that is(are) selected from a halogen atom and a cyano group; X 2 is a hydrogen atom, a cyano group, a nitro group, a C 1-18 alkyl group, a phenyl group, or a biphenyl group, wherein the C 1-18 alkyl group, the phenyl group, or the biphenyl group, is optionally bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond and the phenyl group and the biphenyl group are optionally substituted with any one of a halogen atom and a cyano group; and R 1, R 2, R 3, R 4, R 5, R 6, R 7, and R 8 are independently a hydrogen atom, a C 1-4 alkyl group; a C 1-4 alkoxy group, a halogen atom, a trifluoromethyl group, or a cyano group; and the component is a silicon isocyanate of formula: in which R 3 and R 4 are independently a C 1-6 alkyl group, an isocyanate group, a C 1-6 alkoxy group, a phenyl group, or a vinyl group, and wherein the component has three or more isocyanate groups. a component that is a compound having a photo-aligning group and a hydroxy group; and a component that is a silicon isocyanate compound, wherein the component is a compound of formulae: in which X 1 is a single bond or is C 1-18 alkylene, phenylene, biphenylene, or cyclohexylene bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond, wherein the C 1-18 alkylene, the phenylene, and the biphenylene are optionally substituted with one or more substituent(s) the same as or different from each other that is(are) selected from a halogen atom and a cyano group; X 2 is a hydrogen atom, a cyano group, a nitro group, a C 1-18 alkyl group, a phenyl group, or a biphenyl group, wherein the C 1-18 alkyl group, the phenyl group, or the biphenyl group, is optionally bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond and the phenyl group and the biphenyl group are optionally substituted with any one of a halogen atom and a cyano group; and R 1, R 2, R 3, R 4, R 5, R 6, R 7, and R 8 are independently a hydrogen atom, a C 1-4 alkyl group; a C 1-4 alkoxy group, a halogen atom, a trifluoromethyl group, or a cyano group; and X 1 is a single bond or is C 1-18 alkylene, phenylene, biphenylene, or cyclohexylene bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond, wherein the C 1-18 alkylene, the phenylene, and the biphenylene are optionally substituted with one or more substituent(s) the same as or different from each other that is(are) selected from a halogen atom and a cyano group; X 2 is a hydrogen atom, a cyano group, a nitro group, a C 1-18 alkyl group, a phenyl group, or a biphenyl group, wherein the C 1-18 alkyl group, the phenyl group, or the biphenyl group, is optionally bonded through a covalent bond, an ether bond, an ester bond, an amide bond, an amino bond, or a urea bond and the phenyl group and the biphenyl group are optionally substituted with any one of a halogen atom and a cyano group; and R 1, R 2, R 3, R 4, R 5, R 6, R 7, and R 8 are independently a hydrogen atom, a C 1-4 alkyl group; a C 1-4 alkoxy group, a halogen atom, a trifluoromethyl group, or a cyano group; and the component is a silicon isocyanate of formula: in which R 3 and R 4 are independently a C 1-6 alkyl group, an isocyanate group, a C 1-6 alkoxy group, a phenyl group, or a vinyl group, and wherein the component has three or more isocyanate groups.