According to one embodiment, there is provided an optical coupling module including an optical device and an adaptor. The adaptor is attached to the optical device. The optical device has an optical element and a via. The optical element is placed on a first principal surface of a substrate. The via is placed in the substrate at a position corresponding to the optical element. The via has a first opening in a second principal surface of the substrate opposite to the first principal surface. The via does not reach the first principal surface. The adaptor has a guide hole having a second opening in a third principal surface of the adaptor opposite the second principal surface. The second opening corresponds to the first opening. The guide hole has a third opening in a fourth principal surface of the adaptor.