Radar device

A radar device comprising:

• a first radar and a second radar that are arranged at positions separated from each other, and of which detection ranges are at least partially overlapped;
• and
• an electronic control unit configured to
• derive at least one of a moving direction and a velocity vector of a reflection point existing in an overlapped portion of the detection ranges, based on a first detection result of the first radar and a second detection result of the second radar, the first detection result and the second detection result including information on distances to the reflection point from the first radar and the second radar and information on angles of the reflection point viewed from the first radar and the second radar,
• when determining that a reliability of a radar angle of the radar device is low, derive a position of the reflection point that is represented using a distance and an angle, based on the first detection result and the second detection result without using the information on the angles obtained from the first detection result and the second detection result, and
• after deriving the position of the reflection point, correct a relative angle between the first radar and the second radar when determining that the relative angle deviates from an expected value, the relative angle being a value based on which the at least one of the moving direction and the velocity vector is derived.