Vehicle radar unit

A vehicle radar unit, comprising:

• a radar device configured to emit and receive electromagnetic waves;
• and
• an exterior member, having electromagnetic wave transmissivity, arranged in front of the radar device in an emitting direction of the electromagnetic waves, wherein
• the exterior member includes a light source configured to emit visible light, a housing including an opening that is open frontward in the emitting direction, and a cover having visible light transmittivity and covering the opening,
• the housing includes a bottom wall and an outer wall extending frontward in the emitting direction from an edge of the bottom wall,
• the bottom wall includes a projection projecting in the emitting direction and separated from the radar device, the projection and the outer wall forming an accommodation portion for accommodation of the light source,
• the projection includes an inner wall extending rearward in the emitting direction from an edge of a projection end,
• the radar device is located at a position separated from the inner wall in a direction orthogonal to a central axis extending in the emitting direction through a center of the radar device, and
• an inclination angle of the inner wall with respect to the central axis, a length of the inner wall in the emitting direction, and a shortest distance from the central axis to the inner wall are set so that a tilted angle of a main lobe of the electromagnetic waves emitted from the radar device with respect to the central axis is greater than 0° and less than or equal to 0.38° in absolute value.