A radar device comprising: a first radar module; a second radar module; and a signal processor which is adapted to combine outputs of the first radar module and the second radar module, wherein the first radar module comprises: a first channel controller which is adapted to set a frequency band of a first carrier wave to a frequency band different from a frequency band of a second carrier wave; and a first radar transmitter and receiver which is adapted to transmit a radio-frequency first radar transmission signal generated using a prescribed first transmission code sequence and the first carrier wave, receive a first radar reflection signal produced as a result of reflection of the first radar transmission signal by a target, and convert the first radar reflection signal into a baseband first reception signal, wherein the second radar module comprises: a second channel controller which is adapted to set the frequency band of the second carrier wave to a frequency band different from the frequency band of the first carrier wave; and a second radar transmitter and receiver which is adapted to transmit a radio-frequency second radar transmission signal generated using a prescribed second transmission code sequence and the second carrier wave, receive a second radar reflection signal produced as a result of reflection of the second radar transmission signal by the target, and convert the second radar reflection signal into a baseband second reception signal, and wherein a part of main beam directivity of the first radar transmission signal overlaps with a part of main beam directivity of the second radar transmission signal, and wherein the signal processor is adapted to perform combining processing on the outputs of the first radar module and the second radar module, by one of selection combining, equal gain combining, and maximum ratio combining. a first radar module; a second radar module; and a signal processor which is adapted to combine outputs of the first radar module and the second radar module, wherein the first radar module comprises: a first channel controller which is adapted to set a frequency band of a first carrier wave to a frequency band different from a frequency band of a second carrier wave; and a first radar transmitter and receiver which is adapted to transmit a radio-frequency first radar transmission signal generated using a prescribed first transmission code sequence and the first carrier wave, receive a first radar reflection signal produced as a result of reflection of the first radar transmission signal by a target, and convert the first radar reflection signal into a baseband first reception signal, a first channel controller which is adapted to set a frequency band of a first carrier wave to a frequency band different from a frequency band of a second carrier wave; and a first radar transmitter and receiver which is adapted to transmit a radio-frequency first radar transmission signal generated using a prescribed first transmission code sequence and the first carrier wave, receive a first radar reflection signal produced as a result of reflection of the first radar transmission signal by a target, and convert the first radar reflection signal into a baseband first reception signal, wherein the second radar module comprises: a second channel controller which is adapted to set the frequency band of the second carrier wave to a frequency band different from the frequency band of the first carrier wave; and a second radar transmitter and receiver which is adapted to transmit a radio-frequency second radar transmission signal generated using a prescribed second transmission code sequence and the second carrier wave, receive a second radar reflection signal produced as a result of reflection of the second radar transmission signal by the target, and convert the second radar reflection signal into a baseband second reception signal, and a second channel controller which is adapted to set the frequency band of the second carrier wave to a frequency band different from the frequency band of the first carrier wave; and a second radar transmitter and receiver which is adapted to transmit a radio-frequency second radar transmission signal generated using a prescribed second transmission code sequence and the second carrier wave, receive a second radar reflection signal produced as a result of reflection of the second radar transmission signal by the target, and convert the second radar reflection signal into a baseband second reception signal, and wherein a part of main beam directivity of the first radar transmission signal overlaps with a part of main beam directivity of the second radar transmission signal, and wherein the signal processor is adapted to perform combining processing on the outputs of the first radar module and the second radar module, by one of selection combining, equal gain combining, and maximum ratio combining.