Abstract: A technique to improve degree of freedom in mounting an electrode of an optical device on a wiring substrate without being affected by an angle in the optical fiber circumferential direction of the optical device provided for an optical module is disclosed. According to the technique, an optical device 5, from which a plurality of electrodes 61 to 64 protrude; and a wiring substrate 7, in which a plurality of electrical wirings 10 to connect to the respective plurality of electrodes are formed approximately concentrically are included. Respective ends of the electrodes are connected to the respective plurality of electrical wirings so that distances between the respective ends of the plurality of electrodes and the center of the optical device are different from each other.