Abstract: A projection image display device 1 includes a housing 100, a projection lens 110, a front convex portion 50A and a rear convex portion 50B. The housing 100 accommodates an illumination optical system and a modulation optical system in an interior thereof. The projection lens 110 is configured to project an image modulated by the modulation optical system in a scaled-up size, and is disposed on a first lateral face 100b of the housing 100. The front convex portion 50A and the rear convex portion 50B are disposed on an intersection line between a plane containing an optical axis of the projection lens 110 and a top face 110a of the housing 100.

Abstract: A projection display apparatus (100) has an image light generating unit (200), a projection optical unit (300) and a screen (220). The projection optical unit (300) has a reflection mirror (320). The screen (220) is switchably configured to as to switch to whether to diffuse image light reflected by the reflection mirror (320) or to transmit the image light reflected by the reflection mirror (320).

Abstract: The projection image display apparatus includes an image light generator and a projection optics. The projection optics includes a reflection mirror. The projection image display apparatus includes a motion sensor configured to detect a person being close to a projection region and an image controller configured to control an image to be displayed on a projection region depending on a detection result from the motion sensor.