A backlight unit (49) of a display device (69) including a liquid crystal display panel (59) includes a chassis (41), a diffusion plate (43) which is supported by the chassis, and a point light source for irradiating the diffusion plate with light. The point light source includes an LED (22) mounted on a mounting substrate (21). A plurality of the LEDs are provided and respectively covered with diffusion lenses (24). Optical axes (OA) of the diffusion lenses are tilted relative to the diffusion plate, and the diffusion lenses having different tilts of the optical axes exist on the chassis in a mixed manner. The diffusion lenses having the optical axes which tilt in opposite directions are paired, and the pairs are arranged in a matrix.