Light scanning apparatus and separation distance measurement apparatus

A light scanning apparatus comprising:

• a light source for emitting light in a direction different from a reference direction and different from a direction orthogonal to the reference direction;
• and
• a rotating reflection body that rotates about a rotation axis inclined at an inclination angle φ to the reference direction and comprises at least one reflecting surface that is disposed in a direction intersecting obliquely with the rotation axis and reflects light from the light source incident on the reflecting surface at an incident angle θ, wherein,
• a specific scanning direction is a direction intersecting at a predetermined angle to the reference direction and the rotation axis inclination angle φ≠0, and
• the inclination angle φ is predetermined according to the incident angle θ such that deviation of the scanning beam reflected by the reflecting surface from the specific scanning direction is smaller than the deviation of the scanning beam from the specific scanning direction that would be obtained with the inclination angle φ of the rotation axis=0°.