Reflective screen and image display device

A reflective screen that displays an image by reflecting some image light projected from an image source, the reflective screen comprising:

• an optical shape layer that has optical transparency and a plurality of unit optical shapes arranged in an arrangement direction on a rear surface side;
• and
• reflective layer portions provided on at least part of each unit optical shape, to reflect some incident light and transmit at least some remaining incident light,
• wherein each unit optical shape has, in a cross-sectional shape cut in the arrangement direction, acute-angled vertices that protrude the most on the rear surface side, and a curved valley bottom portion that is depressed the most on an image source side, or curved vertices that protrude the most on the rear surface side and an acute-angled valley bottom portion that is depressed the most on the image source side.