Light source device, projector, and method of assembling light source device

A light source device comprising:

• a first support that supports one of:
• (i) a light source and (ii) a collimator lens which condenses light emitted from the light source;
• a second support that supports the other of the light source and the collimator lens;
• a fixing member that fixes the first support to the second support;
• and
• a locking member comprising a head portion and a rod portion connected to the head,
• wherein the first support comprises a first protruding portion that protrudes from the first support toward the second support, the first protruding portion having a through hole therethrough,
• wherein the second support comprises a second protruding portion that protrudes from the second support toward the first support, the second protruding portion having:
• (i) a receiving portion that receives the first protruding portion, and (ii) a receiving hole, and
• wherein the rod portion of the locking member is inserted into the through hole of the first protruding portion of the first support and the receiving hole of the second protruding portion of the second support, and the head portion of the locking member is sealed with a sealant.