FLUSH LUMP

PROBLEM TO BE SOLVED: To provide a structure capable of minimizing an insulation action between a trigger line and an electrode by a reflection film, sufficiently expecting a dropping function of discharge starting voltage by the trigger line, and using ceramic material with excellent heat resistance as the reflection film, in a flush lamp equipped with a light-emitting tube provided with a pair of electrodes inside, the reflection film provided on an outer surface of the light-emitting tube, and the trigger line disposed along the light-emitting tube on the outside of the reflection film.SOLUTION: On at least one end portion of a light-emitting tube, an end edge in a longitudinal direction of the reflection film is positioned on a front side of an electrode.