Disclosed is an inexpensive, bright, compact, lightweight, high-definition projection-type display device that has a comparatively simple structure but satisfies demands for oblique projection, uniform illumination, a deep focal depth, and magnified projection over a short distance. The display device comprises a light source (1a); an illumination portion (1) consisting of a group of collection angle control components, which comprises at least one optical surface (1c) for receiving a principal light ray generated from the imaginary center of the light source (1a) and controlling the solid collection angle thereof, and a group of luminous flux control components, which comprises at least two optical surfaces which are an optical surface (1d) mainly having a spatial distribution control function over the principal light ray in a virtual plane provided perpendicular to the direction of propagation of the principal light ray emitted from the group of �luminous flux! control components and an optical surface (1e) for receiving a principal light ray from the surface and mainly having a function of controlling the direction thereof; an image creation portion (2) for creating an original image by selectively reflecting or transmitting luminous flux from the illumination portion (1) and for ensuring that the cone angle of the luminous flux contributing to the image creation does not greatly change before and after; and an imaging portion (3) for collecting the luminous flux emitted from the image creation portion and creating a secondary image on a screen.