To provide a photoelectric converter capable of reducing the height of the device. The photoelectric converter includes: a light emitting element or a light receiving element; an IC circuit for transmitting/receiving an electric signal to/from the light emitting element or the light receiving element; a mount substrate adapted to be mounted on one surface from the side on which the light emitting element emits light, or the side on which the light receiving element receives light; an electric connector adapted to be provided on the one surface or the other surface of the mount substrate, and to be attached and detached to and from an external connector; and a waveguide adapted to be provided on the mount substrate along the one surface or the other surface of the mount substrate, and to be optically coupled to the light emitting element or the light receiving element.