Radar apparatus

A radar apparatus, comprising:

• a plurality of transmission antennas;
• transmission switches that select a transmission antenna for transmitting an electromagnetic wave from among the plurality of transmission antennas;
• a plurality of reception antennas that receive a reflected wave which is the electromagnetic wave reflected from a target as reception signals;
• a signal processing unit that detects the target based on a sampling signal obtained by sampling the reception signals;
• and
• a failure judgment unit that compares first reception signals among the reception signals, the first reception signals being transmitted from the selected transmission antenna and received by the plurality of reception antennas, with second reception signals among the reception signals, the second reception signals being transmitted from another of the plurality of transmission antennas and received by the plurality of reception antennas, and judges whether or not any one of the transmission switches has failed based on a comparison result,
• wherein the failure judgment unit judges that the any one of the transmission switches has failed when a difference between a first phase difference between the first reception signals and a second phase difference between the second reception signals is equal to or larger than a first given threshold value.