An optical transmission module includes an optical element, an optical fiber, a holding section to which the optical fiber is bonded and fixed, and a wiring board including a first principal plane on which the optical element is mounted and a second principal plane on which the holding section is bonded and a connection pad connected to the optical element is disposed, and through which light passes. An adhesive tape is inserted between the holding section and the wiring board. The reinforcing resin does not protrude to an outside of the detachment sheet on the second principal plane of the wiring board.
