A transmitting device 10A has a transmission data generating part 11 and an output buffer part 12A. The transmission data generating part 11 transmits a data 1 and a clock 1, which are to be transmitted to a receiving device, and outputs them to the output buffer part 12A. The output buffer part 12A includes a data transmitting part 13 and a clock transmitting part 14A. The clock transmitting part 14A generates and transmits a clock intermittently phase-shifted. The data transmitting part 13 transmits the data in sync with the clock transmitted from the clock transmitting part 14A.