Light source unit, projection display device, and method for manufacturing light source unit

A method for manufacturing a light source unit, the method comprising:

• a distance adjusting step of adjusting, in a holding member of a light source assembly including a light source that emits a laser light, a lens disposed on an optical axis of the laser light, and the holding member that holds the light source and the lens, a distance between the light source and the lens in a direction parallel to the optical axis of the laser light by adjusting a screwing amount between a light source holder holding the light source and a lens holder holding the lens;
• a disposing step of disposing a cylindrical support member on a base provided with an opening, the cylindrical support member having a convex receiving surface extending along a spherical surface so as to surround the optical axis when viewed from a direction parallel to the optical axis, and disposing the light source assembly on the support member such that the holding member is in contact with the receiving surface, after the distance adjusting step;
• an inclination adjusting step of adjusting an inclination of the light source assembly by sliding the holding member with respect to the receiving surface, after the disposing step;
• and
• a fixing step of fixing the light source assembly to the support member at the opening by fixing the support member to the base at the opening and coupling the holding member to the receiving surface at a contact portion with the receiving surface, after the inclination adjusting step.