A line lighting device includes a light emitting unit, a light guide rod and a case. The light emitting unit includes a light emitter emitting light. The light guide rod transmits the light emitted by the light emitting unit and guides the light in a longitudinal direction thereof. The case includes a case main body receiving the light guide rod therein. The light emitting unit is installed to the light guide rod and the case by rotating the light emitting unit by a predetermined angle with respect to the light guide rod and the case, while maintaining a state where a first end of the light guide rod in the longitudinal direction of the light guide rod is opposed to the light emitter.