According to one embodiment, a radar device includes a radio module, a pulse compressor, a Doppler filter processor, a signal processor, an integration processor, an estimation module and a target detector. The radio module receives a plurality of received pulses corresponding to transmission pulses transmitted from a transmitter. The integration processor generates third data by integrating first data generated at the signal processor with second data generated based on first data obtained by a previous scan. The estimation module estimates a position at a time of a next scan based on the third data to generate second data. The target detector detects a target based on the third data.