A time information transmission-reception integrated circuit includes: a reception control circuit for detecting a signal obtained by receiving and amplifying an external radio wave, and generating a clock data signal, based on a carrier signal the phase of which is synchronized with the signal; and a transmission control circuit for generating an amplitude modulation signal obtained by modulating the amplitude of the carrier signal by the transmission time code, by a modulator, and transmitting a relaying radio wave from an antenna, the phase of the relaying radio wave synchronized with the phase of the external radio wave, by correcting the phase shift of the amplitude modulation signal by a phase shifter. Thereby, the phase shift between the external radio wave and the relaying radio wave is cancelled.