Radar receiver calculates a first reception power in each of a predetermined number of beam directions by using a reflected wave signal in a first cell among a plurality of cells into which a region represented by at least one of a distance component and a Doppler frequency component is divided, calculates a second reception power on the basis of reception powers of reception array antennae by using the reflected wave signal in a peripheral cell of the first cell among the plurality of cells, and determines whether or not a target is present in the first cell on the basis of a comparison result between the first reception power and a first threshold value that is a value obtained by multiplying the second reception power by a first coefficient.