A radar device, comprising: a transmission circuit which transmits radio waves; an adjustment circuit which adjusts transmission angles of the radio waves transmitted from the transmission circuit; a reception circuit which receives a plurality of signals, the signals being the radio waves transmitted, based on adjustment made by the adjustment circuit, from the transmission circuit and respectively reflected from an object; and a signal processing circuit which, by processing the received signals, calculates a distance to the object, wherein the signal processing circuit includes: a buffer which stores signal strength data on the received signals received by the reception circuit, the received signals respectively corresponding to the transmission angles; and a correction circuit which performs correction processing on the signal strength data on the received signals stored in the buffer, wherein the correction circuit is configured to extract, from the signal strength data on the received signals stored in the buffer, signal strength data portions, each signal strength data portion being based on an equidistance; calculate an average value of each of the extracted signal strength data, equidistance-based portions; and perform offset processing on the signal strength data on the received signals stored in the buffer by subtracting the calculated average value from the corresponding extracted signal strength data, equidistance-based portion. a transmission circuit which transmits radio waves; an adjustment circuit which adjusts transmission angles of the radio waves transmitted from the transmission circuit; a reception circuit which receives a plurality of signals, the signals being the radio waves transmitted, based on adjustment made by the adjustment circuit, from the transmission circuit and respectively reflected from an object; and a signal processing circuit which, by processing the received signals, calculates a distance to the object, wherein the signal processing circuit includes: a buffer which stores signal strength data on the received signals received by the reception circuit, the received signals respectively corresponding to the transmission angles; and a correction circuit which performs correction processing on the signal strength data on the received signals stored in the buffer, wherein the correction circuit is configured to extract, from the signal strength data on the received signals stored in the buffer, signal strength data portions, each signal strength data portion being based on an equidistance; calculate an average value of each of the extracted signal strength data, equidistance-based portions; and perform offset processing on the signal strength data on the received signals stored in the buffer by subtracting the calculated average value from the corresponding extracted signal strength data, equidistance-based portion. a buffer which stores signal strength data on the received signals received by the reception circuit, the received signals respectively corresponding to the transmission angles; and a correction circuit which performs correction processing on the signal strength data on the received signals stored in the buffer, wherein the correction circuit is configured to extract, from the signal strength data on the received signals stored in the buffer, signal strength data portions, each signal strength data portion being based on an equidistance; calculate an average value of each of the extracted signal strength data, equidistance-based portions; and perform offset processing on the signal strength data on the received signals stored in the buffer by subtracting the calculated average value from the corresponding extracted signal strength data, equidistance-based portion.