Disclosed are: an organic semiconductor material which is characterized by being composed of a perylenetetracarboxydiimide derivative represented by general formula (1),an organic semiconductor thin film,and an organic thin film transistor. In general formula (1), R1 represents an optionally branched alkyl group having 1-20 carbon atoms,R2 represents an optionally branched alkyl group having 2-6 carbon atoms,R3 represents an optionally branched alkyl group having 2-6 carbon atoms,X1 and X2 each represents a heteroatom selected from among an oxygen atom, a sulfur atom and a selenium atom,Y represents a halogen atom or a cyano group,m represents a number of 0-4,and n represents a number of 0-2. In this connection, the alkyl group of R1 and/or R2 may be substituted by a fluorine atom.