Optical scanning device, optical measuring apparatus, and robot

An optical scanning device comprising:

• a light source unit having a light exiting portion from which a light is output;
• a scanning unit having a mirror supported by a supporting part and reflecting the light output from the light exiting portion while swinging the mirror around a swing axis;
• and
• a housing having an enclosed space partitioned by a plurality of wall portions including a first wall portion and a second wall portion, in which the light exiting portion and the scanning unit are placed in the enclosed space, wherein
• the first wall portion transmits the light reflected by the scanning unit, and
• the second wall portion includes a part of the light source unit,
• wherein the scanning unit has a permanent magnet placed on the back surface of the mirror, and an electromagnetic coil placed to face the permanent magnet, and
• the scanning unit has a first member on which the supporting part is placed, a second member coupled to the first member, a third member coupled to the second member, and the electromagnetic coil is placed between the first member and the third member.