Patent ID: 8787799

Claim:
An illuminating device comprising: a light source portion; a translucent elongated light-guiding member for illuminating an illumination target from an elongated light emitting face that extends in a longitudinal direction, by guiding incident light from the light source portion; and a holding member for holding the light-guiding member, wherein the light source portion is provided in such a manner as to guide the light from an end face in the longitudinal direction of the light-guiding member, the light-guiding member is formed in a square or a rectangular shape when viewed from a side in the longitudinal direction, and the holding member comprises: a holding portion formed in a quadrangle shape with one open side when viewed from the side in the longitudinal direction, the holding portion removably holding the light-guiding member fitted to an inner face of the holding portion such that the light emitting face of the light-guiding member is disposed at a face on the open side; and a tilted portion that reflects light from the light source portion that passes through the light-guiding member and that is emitted from the light emitting face, the tilted portion extending from a front end on the light emitting face side of the holding portion, obliquely widening with increasing distance from the light-guiding member.