Light source unit and projector

A light source unit comprising:

• a light source;
• a reflector configured to reflect light emitted from the light source;
• a light source housing including:
• a housing body configured to accommodate the light source and the reflector,
• an inflow port through which cooling air enters,
• a first flow channel and a second flow channel that guide the cooling air entering from the inflow port to an upper portion and a lower portion of the light source respectively, and
• a duct member configured to define the first flow channel and the second flow channel in cooperation with the housing body;
• a rectifying unit configured to rotate and cause the cooling air entering from the inflow port to flow in the first flow channel,
• wherein
• the rectifying unit is provided with an opening configured to cause part of the cooling air entering from the inflow port to flow in the second flow channel,
• the housing body includes a body side surface configured to support one side of the rectifying unit,
• the body side surface includes an inlet port configured to introduce part of the cooling air entering from the inflow port to the interior of the housing body,
• the inflow port allows entry of the cooling air from a direction along an optical axis of the light source, and
• the rectifying unit is supported by the housing body and the duct member so as to rotate about a center axis that intersects a perpendicular plane including the optical axis.