A tire condition detecting system has transmitters and a receiver. The transmitter is installed in a plurality of wheels and the receiver is installed in a chassis of a vehicle. The receiver has a controller which determines transmission timings in which a transmitting/receiving unit transmits the electrical wave for electrical charging to the transmitters. Moreover the controller detects an electrical wave from a nearby vehicle at the transmission timing. If the detected wave from the nearby vehicle is stronger, the controller waits for a predetermined period before making the transmitting/receiving unit transmit the electrical wave.