Light source unit

A light source unit comprising:

• one or two light source substrates, each including light emitting elements mounted thereon;
• a pair of first members that are arranged separately from each other, at least one of the pair of first members is provided with one of the one or two light source substrates attached thereto;
• a pair of light guide members, each of which having end portions at respective both ends in an axial direction thereof, in each of which light from the light emitting elements is introduced therein from at least one of the end portions, and the pair of light guide members emitting the light introduced inside thereof through outer circumferential surfaces thereof;
• and
• a pair of second members between which the pair of respective light guide members are inserted, the pair of second members shielding a part of the light emitted through the outer circumferential surfaces of the pair of light guide members, wherein
• each of the pair of second members is made of a metal material and includes at least a main body portion, two projecting portions extending from both end portions of the main body portion when viewed in an axial direction in directions different from an extending direction of the main body portion, and an opening formed between the projecting portions through which the light emitted from the light guide member passes,
• each of the pair of second members includes end portions at both ends thereof in the axial direction, and the end portions are attached to the pair of first members respectively, in a state in which the pair of second members are arranged between the pair of first members, so that the pair of second members receive heat generated from the light source substrate through at least one of the first members,
• the pair of second members are arranged separately from each other in a direction orthogonal to the axial direction, forming a void portion therebetween when viewed in the axial direction, so that an optical axis of an image capturing device passes through the void portion, and
• the pair of light guide members are held at least by the pair of respective second members.