| 摘要 |
PROBLEM TO BE SOLVED: To provide an image projection device capable of reducing deterioration of optical performance at a lower cost.SOLUTION: An image projection device comprises: a housing; and a projection optical system having a concave mirror and for projecting an image in conjugation with an object to a target projection surface. In the image projection device, the entirety of the projection optical system is housed inside the housing. The housing has a dent. The dent includes inclinations with respect to a first opening through which projection light reflected by the concave mirror is passed and with respect to a second opening, as the opening of the dent, which is formed nearer to the target projection surface side than the first opening. |
