According to a conventional method of correlating beat frequencies in a radar device, a detecting state of a target differs at the time of up-chirping and at that of down-chirping, so that, when the number of peaks of beat frequencies does not match with each other, there occurs a situation in which the beat frequencies cannot be accurately correlated.The radar device herein provided includes a transmission unit for transmitting a frequency-modulated continuous wave (FMCW) signal; a reception unit for generating a beat signal from the transmission signal and a reception signal corresponding thereto; a beat-frequency generating unit for obtaining a beat-frequency distribution corresponding to the beat signal; an up-chirp beat-frequency tracking means and a down-chirp beat-frequency tracking means for performing tracking processing on a beat signal; and an up-chirp target-detection means and a down-chirp target-detection means for calculating a range and range-change rate to a target based on a beat signal's frequency distribution.