An object of the present invention is to provide an organic semiconductor device comprising a semiconductor layer containing a compound with improved cohesive force, controllable molecular orientation, high packing property, high overall electrical conduction, high durability and high time-dependent stability. The present invention provides; a tertiary amine compound represented by formula (1); an organic semiconductor device comprising a substrate; a gate electrode; source and drain electrodes; and a semiconductor layer, wherein the semiconductor layer contains the tertiary amine comuound represented by formula (1).