First and second radar modules include channel controllers which set different frequency bands for first and second carrier waves, respectively, and first radar transmitter and receiver which transmit radio-frequency first and second radar transmission signals generated using prescribed first and second transmission code sequences and the first and second carrier waves, which receive first and second radar reflection signals produced as a result of reflection of the first and second radar transmission signals by a target, and which convert them into baseband first and second reception signals. A signal processor performs prescribed combining processing on outputs of the first and second radar modules. The first and second radar transmission signals partially overlap with each other in main beam directivity.