A radar apparatus comprising: a plurality of transmission radars (100-n Tx) for radiating transmission signals each having different frequencies generated using a pulse signal and an intra-pulse modulation signal for modulating the pulse signal; a reception unit (220-1, 220-n Rx) for converting reception signals of the transmission signals reflected back by a target into reception video signals; a range-direction frequency domain converting unit (231-1, 231-n Rx) for converting the reception video signals into signals based on a range direction frequency; a hit-direction frequency domain converting unit (232-1, 232-n Rx) for converting, by a chirp z conversion with a Doppler frequency interval changed for each of different transmission frequencies and each range direction frequency bin, the signals based on the range direction frequency into signals based on a velocity and a range direction frequency so that a target Doppler frequency belongs to a same velocity bin number independently of variations in frequencies of the transmission signals; a correlation unit (233-1, 233-n Rx, 233a-n Rx) for generating a reference signal corresponding to transmission frequencies of the plurality of transmission radars and to a velocity corresponding to a velocity bin number, performing correlation processing on the signals output from the hit-direction frequency domain converting unit (232-1, 232-n Rx) using the reference signal corresponding to transmission frequencies of the plurality of transmission radars and to a velocity corresponding to a velocity bin number and performing pulse compression to generate signals based on the velocity separated for each of the transmission frequencies of the plurality of transmission radars and a range after correlation; an integration unit (234-1, 234-n Rx) for integrating the signals output from the correlation unit (233-1, 233-n Rx, 233a-n Rx) with a target arrival angle candidate to generate a band-synthesized signal based on the velocity and the range after correlation; a candidate target detecting unit for detecting a candidate target on a basis of signal intensity from the signals output from the integration unit (234-1, 234-n Rx); and a target relative velocity/relative range/arrival angle calculating unit for calculating a relative velocity, a relative range, and an arrival angle of the candidate target. a plurality of transmission radars (100-n Tx) for radiating transmission signals each having different frequencies generated using a pulse signal and an intra-pulse modulation signal for modulating the pulse signal; a reception unit (220-1, 220-n Rx) for converting reception signals of the transmission signals reflected back by a target into reception video signals; a range-direction frequency domain converting unit (231-1, 231-n Rx) for converting the reception video signals into signals based on a range direction frequency; a hit-direction frequency domain converting unit (232-1, 232-n Rx) for converting, by a chirp z conversion with a Doppler frequency interval changed for each of different transmission frequencies and each range direction frequency bin, the signals based on the range direction frequency into signals based on a velocity and a range direction frequency so that a target Doppler frequency belongs to a same velocity bin number independently of variations in frequencies of the transmission signals; a correlation unit (233-1, 233-n Rx, 233a-n Rx) for generating a reference signal corresponding to transmission frequencies of the plurality of transmission radars and to a velocity corresponding to a velocity bin number, performing correlation processing on the signals output from the hit-direction frequency domain converting unit (232-1, 232-n Rx) using the reference signal corresponding to transmission frequencies of the plurality of transmission radars and to a velocity corresponding to a velocity bin number and performing pulse compression to generate signals based on the velocity separated for each of the transmission frequencies of the plurality of transmission radars and a range after correlation; an integration unit (234-1, 234-n Rx) for integrating the signals output from the correlation unit (233-1, 233-n Rx, 233a-n Rx) with a target arrival angle candidate to generate a band-synthesized signal based on the velocity and the range after correlation; a candidate target detecting unit for detecting a candidate target on a basis of signal intensity from the signals output from the integration unit (234-1, 234-n Rx); and a target relative velocity/relative range/arrival angle calculating unit for calculating a relative velocity, a relative range, and an arrival angle of the candidate target.