A radar device (100, 200) according to the present invention is provided with: a transmission array antenna (3) for transmitting reciprocally orthogonal signals through a plurality of transmission antennas; a reception array antenna (4) for receiving signals reflected by a target, through a plurality of reception antennas; and a signal processing unit (6, 26) that detects the target from the reception signals received through the plurality of reception antennas. The signal processing unit (6, 26) is provided with: separating units (10) that separate the reception signals received through the plurality of reception antennas, into signals corresponding to the transmission signals from the plurality of transmission antennas; correlation matrix calculating units (11, 18) that obtain, on the basis of the reception signals separated by the separating units, a first correlation matrix corresponding to the transmission array antennas and a second correlation matrix corresponding to the reception array antennas; and a detecting unit (13) that detects the target on the basis of an evaluation value calculated with use of eigenvectors of the first and second correlation matrixes. Accordingly,multiple target reflection waves can be separately detected while deterioration in angular resolution and increase in a beam side lobe are suppressed.