Projector with lamp unit having a U-shaped insertion frame

A projector, comprising:

• a lamp unit which constitutes a lamp, and a frame which is formed around the periphery of a first exhaust aperture of said lamp unit for exhausting air which has been taken into the interior of the lamp unit and has passed said lamp;
• and
• a lamp unit housing unit, provided within a chassis of said projector, which constitutes a partitioned-off housing space within said chassis and comprises an installation surface upon its inner wall for installing said lamp unit;
• wherein:
• said lamp unit housing unit comprises a substantially U-shaped insertion frame which is formed around the periphery of a second exhaust aperture provided upon said installation surface, for exhausting said air entering through said first exhaust aperture when said lamp unit is installed;
• said lamp unit comprises an edge and a plate on the outside of said frame;
• said edge is a member which contacts against the end portion of said insertion frame of said lamp unit housing unit in the exhaust direction, in the installed state in which said lamp unit is installed to said lamp unit housing unit by engaging said frame to said insertion frame from both ends of the U-shape of said insertion frame;
• and
• said plate is a member which, in said installed state, contacts in said exhaust direction with its end edge portion against said installation surface formed upon said insertion frame, and moreover, in said installed state, contacts in the engagement direction with its end edge portion against the aperture line which connects said both ends of said insertion frame.