An organic transistor includes a gate electrode having a predetermined length, source and drain electrodes overlapping the gate electrode in plan view, a channel region formed of the organic semiconductor between the source and drain electrodes, and a functional portion disposed on a first side of the gate electrode in a length direction thereof and connected to the drain electrode through a strip-like connection wiring line. A strip-like dummy connection wiring line is connected to the drain electrode so as to extend toward a second side of the gate electrode in the length direction thereof and has a width that is less than twice the width of the connection wiring line. The connection wiring line extends to or beyond an edge of the gate electrode on the first side, and the dummy connection wiring line extends to or beyond an edge of the gate electrode on the second side.