The present invention relates to a photoelectric converter comprising: a mount substrate; an IC circuit provided on the mount substrate; an optical element adapted to have a function of converting an electric signal output by the IC circuit to an optical signal and emitting light, or a function of converting a received optical signal to an electric signal and outputting the electric signal to the IC circuit; and a waveguide adapted to effect an optical coupling between the optical element and an external optical device, wherein the optical element is held by the mount substrate and has a light emitting surface or a light receiving surface, the light emitting surface or the light receiving surface of the optical element being directed to the mount substrate, and wherein the waveguide is provided in the mount substrate along the surface of the mount substrate.
