To provide an optical
transceiver module comprising an optical
prism for optical communications which has mounting portions, a light emitting portion, light receiving portions, a substrate and a sub-
mount that are used as the basis of the optical
transceiver module, whose configuration is compact with reduced components which are accurately mounted.A sub-
mount is provided on the substrate. The composite optical
prism is formed with an optical lens provided with mounting supports and a
wavelength division film in an integrated fashion. By using marks on the sub-
mount for alignment, the composite optical
prism can be mounted accurately on the sub-mount. In addition, the light receiving portions and the light emitting portion can be mounted accurately by using marks for alignment provided on the substrate and the sub-mount.