Provided is a compact optical communication module which is configured and structured so as to be suitable for high-speed transmission and which facilitates the fixing and positioning of optical elements and prevents misalignment of the optical axis during temperature change. An optical communication module is constituted so as to have a transceiver circuit as the circuit substrate, a submount unit, a fiber stub as an optical connector member, and an optical fiber coupling member. The optical communication module is configured as a modular component in which the optical axis of an optical element mounted on the submount unit is roughly parallel to the mounting surface of the transceiver circuit.