There is provided a radar device. A transmitting unit transmits a transmitted wave of a modulation wave whose frequency changes cyclically. A receiving unit receives a reflected wave which is the transmitted wave reflected by a target. A detection unit detects the target based on the reflected wave received by the receiving unit. An adjusting unit adjusts a modulation waveform of the transmitted wave transmitted from the transmitting unit such that the target provided at a known position as an object is detected by the detection unit at the known position and the target is not detected at positions other than the known position by the detection unit.