PROBLEM TO BE SOLVED: To alleviate a demand for high frequency stability for an oscillation circuit of a millimeter-wave communication system while achieving both small size and light weight of an imaging unit, securing a long transmission distance, and increasing a communication speed. A waveguide 30 for transmitting a millimeter wave or a submillimeter wave is provided between a first unit 10A having an imaging unit and a second unit 20A having an image processing unit, and the second unit 20A has a millimeter wave. The carrier wave generation unit 202 and the demodulation unit 203 that reproduces the video signal generated by the imaging unit from the millimeter wave modulated wave generated by the first unit 10A received via the waveguide 30 are provided, while the first unit. A millimeter-wave carrier wave that has passed through the waveguide 30 is received by one unit 10A, and a video signal generated by the imaging unit is superimposed on the millimeter-wave carrier wave to generate a millimeter-wave modulated wave, and the millimeter-wave modulated wave is transmitted to the waveguide. A processing transmission unit 102 for transmitting toward 30 is provided. [Selection diagram] Fig. 1【課題】撮像ユニットの小型軽量化、長い伝送距離の確保および通信速度の高速化を両立しながら、ミリ波通信システムの発振回路に対する高い周波数安定度への要求を緩和する。【解決手段】撮像部を有する第１ユニット１０Ａと、映像処理部を有する第２ユニット２０Ａとの間にミリ波又はサブミリ波を伝送する導波路３０を設け、前記第２ユニット２０Ａに、ミリ波搬送波生成部２０２と、導波路３０を経由して受信した第１ユニット１０Ａで生成されたミリ波変調波から撮像部で生成された映像信号を再生する復調部２０３とを設け、一方、前記第１ユニット１０Ａに、導波路３０を経由したミリ波搬送波を受信すると共に撮像部で生成した映像信号を当該ミリ波搬送波に重畳してミリ波変調波を生成し、当該ミリ波変調波を導波路３０に向けて送信する処理送信部１０２を設ける。【選択図】図１
