A composition for forming an organic semiconductor film, comprising: an organic semiconductor represented by the following Formula A-2 as a component A; a solvent as a component B; and optionally a binder polymer as a component C, wherein a content of a non-halogen-based solvent is equal to or greater than 50% by mass with respect to a total content of the component B, and a content of the component A in the composition for forming an organic semiconductor film is equal to or greater than 0.7% by mass and less than 15% by mass, in Formula A-2, rings A to E each independently represent a benzene ring or a thiophene ring, and preferably 2 to 4 rings among the rings A to E are thiophene rings; R represents an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, an aromatic heterocyclic group which is a 5- to 30-membered ring, or a fluorine atom; L each independently represents a phenylene group or a thienylene group; Z each independently represents a group represented by Formula a-1; m each independently represents an integer of 1 to 4; when there are two or more L's, L's may be the same as or different from each other; when there are two or more Z's, Z's may be the same as or different from each other; x represents an integer of 1 to 3; y represents 0 or 1; z represents 0 or 1; and the symmetry of a ring-fused structure formed of the rings A to E is C 2, C 2v, or C 2h,, in Formula a-1, p represents an integer of 1 to 20, and preferably an integer of 1 to 6, q represents an integer of 0 to 20, and ∗ represents a binding position with respect to other structures, wherein the rings A and E are thiophene rings and/or L is a thienylene group. an organic semiconductor represented by the following Formula A-2 as a component A; a solvent as a component B; and optionally a binder polymer as a component C, wherein a content of a non-halogen-based solvent is equal to or greater than 50% by mass with respect to a total content of the component B, and a content of the component A in the composition for forming an organic semiconductor film is equal to or greater than 0.7% by mass and less than 15% by mass, in Formula A-2, rings A to E each independently represent a benzene ring or a thiophene ring, and preferably 2 to 4 rings among the rings A to E are thiophene rings; R represents an alkyl group having 1 to 20 carbon atoms, an alkenyl group having 2 to 20 carbon atoms, an alkynyl group having 2 to 20 carbon atoms, an aromatic hydrocarbon group having 6 to 30 carbon atoms, an aromatic heterocyclic group which is a 5- to 30-membered ring, or a fluorine atom; L each independently represents a phenylene group or a thienylene group; Z each independently represents a group represented by Formula a-1; m each independently represents an integer of 1 to 4; when there are two or more L's, L's may be the same as or different from each other; when there are two or more Z's, Z's may be the same as or different from each other; x represents an integer of 1 to 3; y represents 0 or 1; z represents 0 or 1; and the symmetry of a ring-fused structure formed of the rings A to E is C 2, C 2v, or C 2h,, in Formula a-1, p represents an integer of 1 to 20, and preferably an integer of 1 to 6, q represents an integer of 0 to 20, and ∗ represents a binding position with respect to other structures, wherein the rings A and E are thiophene rings and/or L is a thienylene group.