Light source device and projector

A light source device comprising:

• a light source unit including:
• a first mounting substrate on which a first light emitting element is mounted;
• a second mounting substrate that is disposed in parallel to the first mounting substrate and on which a second light emitting element is mounted;
• and
• a base member on which the first mounting substrate and the second mounting substrate are placed;
• a wavelength conversion unit including:
• a wavelength conversion wheel configured to emit, from a second surface opposite to a first surface, wavelength-converted light obtained by wavelength-converting light emitted from the first light emitting element and the second light emitting element and made incident from the first surface;
• and
• a wheel housing configured to house the wavelength conversion wheel;
• and
• an optical unit including:
• a condensing optical system configured to condense the light emitted from the first light emitting element and the second light emitting element on the wavelength conversion wheel;
• a pickup optical system configured to pick up the wavelength-converted light;
• and
• an optical housing configured to hold the condensing optical system and the pickup optical system to locate the wavelength conversion wheel on an optical path between the condensing optical system and the pickup optical system, wherein
• the condensing optical system includes:
• a first lens on which the light emitted from the first light emitting element is directly made incident;
• and
• an optical-path changing member including a first reflection surface and a second reflection surface and configured to reflect, with the first reflection surface, the light emitted from the second light emitting element in a direction in which the light is brought closer to the light emitted from the first light emitting element and reflect, with the second reflection surface, the light reflected by the first reflection surface and make the light incident on the first lens,
• the optical housing includes:
• a first supporting section formed to recess to the wavelength conversion wheel side with respect to a holding surface for holding the light source unit and configured to support the optical-path changing member;
• and
• a second supporting section formed to recess to the wavelength conversion wheel side with respect to a bottom surface of the first supporting section and configured to support the first lens, and
• the holding surface of the optical housing and the base member are fixed.