A radar apparatus comprising: a radar transmitter adapted to repeatedly transmit a radar transmission signal every radar transmission period, the radar transmission signal including a plurality of pulse-compression codes; and a radar receiver adapted to receive a reflected wave signal which is the radar transmission signal being reflected by an object, wherein the radar receiver includes sampling circuitry (207, 208) adapted to perform discrete sampling on the reflected wave signal at discrete times based on the radar transmission period, correlation calculation circuitry adapted to calculate correlation values between results of the discrete sampling and the plurality of pulse-compression codes every radar transmission period, a plurality of adders (210, 211) adapted to add the correlation values calculated every radar transmission period, the number of additions being different for each of the plurality of adders, a plurality of Doppler frequency analyzers (212, 213), each of which is adapted to perform Doppler frequency analysis on the results of the additions by its respective adder (210, 211) through fast Fourier transforms, and Doppler frequency correction circuitry adapted to (i) determine whether or not a folding in a Doppler frequency included in the reflected wave signal is present based on an amplitude difference or phase difference between two of the peaks of the spectra of the results of the analyses performed by the plurality of Doppler frequency analyzers (212, 213), and (ii) make a correction to the Doppler frequency included in the reflected wave signal on the basis of the results of the analyses in case it is determined that the folding is present. a radar transmitter adapted to repeatedly transmit a radar transmission signal every radar transmission period, the radar transmission signal including a plurality of pulse-compression codes; and a radar receiver adapted to receive a reflected wave signal which is the radar transmission signal being reflected by an object, wherein the radar receiver includes sampling circuitry (207, 208) adapted to perform discrete sampling on the reflected wave signal at discrete times based on the radar transmission period, correlation calculation circuitry adapted to calculate correlation values between results of the discrete sampling and the plurality of pulse-compression codes every radar transmission period, a plurality of adders (210, 211) adapted to add the correlation values calculated every radar transmission period, the number of additions being different for each of the plurality of adders, a plurality of Doppler frequency analyzers (212, 213), each of which is adapted to perform Doppler frequency analysis on the results of the additions by its respective adder (210, 211) through fast Fourier transforms, and Doppler frequency correction circuitry adapted to (i) determine whether or not a folding in a Doppler frequency included in the reflected wave signal is present based on an amplitude difference or phase difference between two of the peaks of the spectra of the results of the analyses performed by the plurality of Doppler frequency analyzers (212, 213), and (ii) make a correction to the Doppler frequency included in the reflected wave signal on the basis of the results of the analyses in case it is determined that the folding is present.