According to one embodiment, an optical semiconductor module is disclosed. The module includes an optical semiconductor. An electrode lead is arranged apart from the optical semiconductor element. A resin holds the optical semiconductor element and the electrode lead. An interconnect layer electrically or functionally connects the optical semiconductor element and the electrode lead. The optical semiconductor element and the electrode lead are embedded in the same surface side of the resin. A part of the interconnect layer is directly provided on the resin or provided on the resin via an insulating layer.