Light source device with thermal dissipating members

A light source device comprising:

• a light emitting module;
• first thermal dissipation member that is metallic and bowl-shaped, and has a flat bottom having an inner surface onto which the light emitting module is attached, the first thermal dissipation member is integrally formed as a single member;
• a circuit unit that is configured to light the light emitting module;
• a base that is electrically connected to the circuit unit;
• a second thermal dissipation member that is made of an electrically insulating material, and includes a cylindrical part made of resin and has the base attached thereto at one end thereof and an opening at the other end thereof, the cylindrical part having the circuit unit housed therein;
• a metal cylinder that is partially embedded in the cylindrical part by insert-molding so as to be separated and electrically insulated from the base, the metal cylinder covering the cylindrical part at a side closer to the other end than the base in close contact with an outer circumferential surface of the cylindrical part;
• and
• a thermal insulation member that is inserted between the first thermal dissipation member and the second thermal dissipation member, wherein
• the thermal insulation member is plate-like, and is provided so as to close the opening of the cylindrical part of the second thermal dissipation member.