Radar apparatus

A radar apparatus, comprising:

• a radar transmission circuit that transmits a radar signal from a transmission array antenna;
• and
• a radar reception circuit that receives, from a reception array antenna, a reflected wave signal that is the radar signal reflected at a target,
• wherein one of the transmission array antenna and the reception array antenna includes a first antenna element group having m antenna elements arranged at a first interval Dt along a first axis direction, wherein m is an integer of 2 or larger,
• an other one of the transmission array antenna and the reception array antenna includes a second antenna element group having n antenna elements arranged at a second interval Dr along the first axis direction, wherein n is an integer of 4 or larger,
• the second interval Dr includes several different intervals,
• when n is an odd number, two intervals located on both sides of an innermost antenna element of the second antenna element group are a smallest second interval Dr, and
• when n is even, an interval between two innermost antenna elements in the second antenna element group is the smallest second interval Dr.