Light guide device

The present invention provides a light guide device capable of accurately guiding a light flux controlled by three reflection surfaces to an emission part on the peripheral surface of a light guide plate. The light guide plate (2) is provided with an incident section (4) on the surface facing the plurality of light sources (3), and an exit section (5) on the front peripheral surface. A first reflecting surface (6), a second reflecting surface (7) and a third reflecting surface (8) are arranged on the light guide plate between the incident part and the emitting part, the first reflecting surface reflects the light beam from the incident part to a first direction opposite to the emitting part, the second reflecting surface reflects the light beam from the first reflecting surface to a seconddirection crossed with the first direction, and the third reflecting surface reflects the light beam from the second reflecting surface to the emitting part and to a third direction. The second reflecting surface includes an