Light guide device

The utility model aims to provide a light guide device, which can be used for removing point light of an emitting part to form an attractive linear or strip-shaped slender light-emitting pattern. A light guide device (11) is provided with a light guide plate (12) for guiding light emitted from a light source (17), and the light guide plate (12) is provided with: an incident section (18) into whichthe light emitted from the light source (17) is incident; reflection sections (23, 24) that reflect light from the incident section (18) toward the inside of the light guide plate (12); and an emission section (27) for emitting the light from the reflection sections (23, 24) to the outside of the light guide plate (12), the emission section (27) being elongated in a first portion of the circumferential surface of the light guide plate (12), and the reflection sections (23, 24) including an expansion surface for diffusing the light from the incident section (18) in the circumferential direction of the light guide plat