To provide a radar device that can improve accuracy for measuring distance especially at a short-distance range and at the same time can be miniaturized with reduced weight, by providing a means for preventing routing of a transmission signal to a reception side.

A delay 200 and a DC component elimination circuit 300 are provided, a routing component is set to a DC component by obtaining difference between a frequency of a reception signal including routing and a frequency of a frequency modulation signal that is delayed by the delay 200 by routing delay time, and the DC component is eliminated by a DC component elimination circuit 300, thus eliminating a surplus signal due to routing from a signal being fed to a frequency analyzer 8. Also, a circulator 100 is provided and an electronic wave is transmitted/received by one transmission/reception antenna 6 via the circulator 100.