To provide an optical transmitter-receiver capable of connecting an external device/circuit or the like and transmitting information without using a connector.

Radio signals are inputted from the outside to a radio demodulation circuit 16, a control circuit 10 controls a driving circuit 4 on the basis of contents of the radio signals and optical signals are transmitted from a light emitting element 5 to an optical cable 1(a). Also, a reproducing circuit 7 converts the optical signals received through the optical cable 1(b) to reception data and a radio modulation circuit 22 modulates the reception data to the radio signals and outputs them to the outside.