LIGHTING DEVICE

The present invention relates to a lighting device comprising a light emitter, a linearly-extending light guide body and a holder configured to hold the light guide body with the light guide body facing the light emitter, wherein the holder includes a holder body to be assembled with the light emitter, two sandwiching portions configured to engage with each other in a state in which a holding target portion of the light guide body held by the holder is sandwiched in a direction crossing an extending direction of the holding target portion and a reducer provided at a position next to the two sandwiching portions in the extending direction and configured to reduce shift of an engagement portion between the two sandwiching portions toward a position of the holder body in the extending direction, the reducer is a protruding portion protruding from the holder body toward the two sandwiching portions in the extending direction.