Radar device

A radar device comprising:

• reception array antennas each comprising virtual antennas constructed from plural transmission antennas and plural reception antennas;
• and
• a transmission control unit which controls transmission waves transmitted from the transmission antennas, wherein:
• the plural transmission antennas comprise:
• a first transmission antenna group having at least two of the transmission antennas that are spaced from each other by a prescribed first interval;
• and
• a second transmission antenna group having at least one of the transmission antenna that is spaced, by a prescribed second interval, from a synthesized antenna that is the first transmission antenna group as regarded as a single antenna;
• and
• the transmission control unit is capable of switching between:
• a first mode in which to control the transmission antennas of the first transmission antenna group independently of each other;
• and
• a second mode in which to control the synthesized antenna and the second transmission antenna group independently of each other.