A radar device including: an antenna (4-a, 4-b) for radiating beams (5-a) in a plurality of directions and for receiving as reception waves (5-b) the beams having been reflected by targets by mechanically or electronically changing the beam radiating/receiving direction; a receiver for performing detection processing on the reception waves (5-b) received by the antenna (4-a, 4-b), to output received signals; a signal detector for extracting from the received signals outputted by the receiver amplitudes and/or phases of the reception waves; a direction calculating unit for calculating, according to the monopulse technique, a primary direction, being the direction of a target, from a combination of the characterizing quantities calculated by the signal detector based on the reception waves from at least two beams that partially overlap, among the beams radiated in the plurality of directions; and a direction integrating unit (13, 14) for, when a plurality of primary directions calculated by the direction calculating unit is present, calculating an integrated direction, which is the true target direction, from an area in which the density in a distribution of the reception wave characterizing quantities used in calculating the plurality of primary directions or of the plurality of primary directions is a predetermined value or greater, the integrated direction calculation being based on the primary directions belonging to the area, wherein the direction integrating unit (13, 14) forms a cluster from the primary directions belonging to the area in which the density is a predetermined value or greater, and calculates the integrated direction of that cluster, characterized in that the direction integrating unit (13, 14) estimates by iterative refinement, assigning the calculated integrated direction to an initial value of an angle component, the target directions by performing model fitting on model reception signals that are preset assuming the angle and reflectance ratio of the target, and the received signals used in calculating the primary direction by the direction calculating unit, or in that the direction integrating unit (13, 14) selects from the primary directions belonging to the cluster a predetermined number of primary directions, and performs the model fitting for estimating the reflectance ratio by iterative refinement using a least-square method assuming one of the selected primary directions as the angle component fixed to the estimated integrated direction of the target. an antenna (4-a, 4-b) for radiating beams (5-a) in a plurality of directions and for receiving as reception waves (5-b) the beams having been reflected by targets by mechanically or electronically changing the beam radiating/receiving direction; a receiver for performing detection processing on the reception waves (5-b) received by the antenna (4-a, 4-b), to output received signals; a signal detector for extracting from the received signals outputted by the receiver amplitudes and/or phases of the reception waves; a direction calculating unit for calculating, according to the monopulse technique, a primary direction, being the direction of a target, from a combination of the characterizing quantities calculated by the signal detector based on the reception waves from at least two beams that partially overlap, among the beams radiated in the plurality of directions; and a direction integrating unit (13, 14) for, when a plurality of primary directions calculated by the direction calculating unit is present, calculating an integrated direction, which is the true target direction, from an area in which the density in a distribution of the reception wave characterizing quantities used in calculating the plurality of primary directions or of the plurality of primary directions is a predetermined value or greater, the integrated direction calculation being based on the primary directions belonging to the area, wherein the direction integrating unit (13, 14) forms a cluster from the primary directions belonging to the area in which the density is a predetermined value or greater, and calculates the integrated direction of that cluster, characterized in that the direction integrating unit (13, 14) estimates by iterative refinement, assigning the calculated integrated direction to an initial value of an angle component, the target directions by performing model fitting on model reception signals that are preset assuming the angle and reflectance ratio of the target, and the received signals used in calculating the primary direction by the direction calculating unit, or in that the direction integrating unit (13, 14) selects from the primary directions belonging to the cluster a predetermined number of primary directions, and performs the model fitting for estimating the reflectance ratio by iterative refinement using a least-square method assuming one of the selected primary directions as the angle component fixed to the estimated integrated direction of the target.