Optical scanning device, projection device, and display device

An optical scanning device comprising:

• a light source to emit a light beam;
• a scanning member to deflect the light beam emitted from the light source to cause the deflected light beam to two-dimensionally scan a scanning area in a first direction and a second direction perpendicular to the first direction;
• and
• an incident optical system to guide the light beam emitted from the light source to the scanning member, the incident optical system including the light source,
• wherein the scanning area includes a first area and a second area surrounding the first area, and
• wherein, when the scanning area is viewed from a side of the scanning member, at least a part of the incident optical system is disposed in an area of the second area that overlaps one of two divided areas of the scanning area, the two divided areas divided by a line segment parallel to the first direction.