An organic transistor comprising a semiconductor active layer which is represented by the following Formula and has a molecular weight of equal to or less than 3,000; in Formula, X represents an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, or NR 5; Y and Z each independently represent CR 6, an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, or NR 7, two Y's may be the same as or different from each other, and two Z's may be the same as or different from each other; a ring containing Y and Z is an aromatic heterocycle; any one of R 1 and R 2 and the aromatic heterocycle containing Y and Z may be bonded to each other through the following group A of divalent linking groups; any one of R 3 and R 4 and a benzene ring may be bonded to each other through the following group A of divalent linking groups; the group A of divalent linking groups represents any one of divalent linking groups -O-, -S-, NR 8 -, -CO-, -SO-, and -SO 2 - or represents a divalent linking group in which two or more of these divalent linking groups are bonded to each other; R 1, R 2, R 5, R 6, R 7, and R 8 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heteroaryl group and may further have a substituent; R 3 and R 4 each independently represent an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heteroaryl group and may further have a substituent, in a case where m is 2, R 3 's may be the same as or different from each other, and in a case where n is 2, R 4 's may be the same as or different from each other; m and n each independently represent an integer of 0 to 2; here, a case where both of Y and Z are CR 6 and a case where both of Y and Z are any one of a nitrogen atom and NR 7 are excluded; in a case where X is NR 5, Y is CR 6, and Z is a sulfur atom, a case where both of R 1 and R 2 are a hydrogen atom is excluded; in a case where X is a sulfur atom, Y is CH, Z is a sulfur atom, and both of R 1 and R 2 are an alkyl group, one of R 1 and R 2 and the aromatic heterocycle containing Y and Z are bonded to each other through the group A of divalent linking groups; and a case where both of R 1 and R 2 are a hydrogen atom, and both of m and n are 0 is excluded. X represents an oxygen atom, a sulfur atom, a selenium atom, a tellurium atom, or NR 5; Y and Z each independently represent CR 6, an oxygen atom, a sulfur atom, a selenium atom, a nitrogen atom, or NR 7, two Y's may be the same as or different from each other, and two Z's may be the same as or different from each other; a ring containing Y and Z is an aromatic heterocycle; any one of R 1 and R 2 and the aromatic heterocycle containing Y and Z may be bonded to each other through the following group A of divalent linking groups; any one of R 3 and R 4 and a benzene ring may be bonded to each other through the following group A of divalent linking groups; the group A of divalent linking groups represents any one of divalent linking groups -O-, -S-, NR 8 -, -CO-, -SO-, and -SO 2 - or represents a divalent linking group in which two or more of these divalent linking groups are bonded to each other; R 1, R 2, R 5, R 6, R 7, and R 8 each independently represent a hydrogen atom, an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heteroaryl group and may further have a substituent; R 3 and R 4 each independently represent an alkyl group, an alkenyl group, an alkynyl group, an aryl group, or a heteroaryl group and may further have a substituent, in a case where m is 2, R 3 's may be the same as or different from each other, and in a case where n is 2, R 4 's may be the same as or different from each other; m and n each independently represent an integer of 0 to 2; here, a case where both of Y and Z are CR 6 and a case where both of Y and Z are any one of a nitrogen atom and NR 7 are excluded; in a case where X is NR 5, Y is CR 6, and Z is a sulfur atom, a case where both of R 1 and R 2 are a hydrogen atom is excluded; in a case where X is a sulfur atom, Y is CH, Z is a sulfur atom, and both of R 1 and R 2 are an alkyl group, one of R 1 and R 2 and the aromatic heterocycle containing Y and Z are bonded to each other through the group A of divalent linking groups; and a case where both of R 1 and R 2 are a hydrogen atom, and both of m and n are 0 is excluded.