A transmission device (11) comprises a transmitter (13) for transmitting various signals to a reception device (12), a receiver (15) for receiving a response signal emitted from the reception device (12) in response to the transmission of the various signals from this transmitter (13) to the reception device (12), a transmission/reception controller (14) for performing control of the receiver (15) and the transmitter (13), and a reception specifier (16) for specifying the reception timing of the intermittent reception of the reception device (12) when a response signal from the reception device (12) has been received. The transmission/reception controller (14) decides the timing at which the transmission of the various signals will begin, and how long the transmission will last, on the basis of the reception timing specified by the reception specifier (16).
