DISCHARGE LAMP AND LIGHTING TOOL FOR VEHICLE

摘要

The purpose of the present invention is to provide a discharge lamp and a lighting tool for a vehicle capable of controlling the boost of tube voltage during product life. A discharge lamp (100) according to an embodiment comprises: a light emitting part (11) having a discharge space (111) inside in which a metal halide (2) including an indium halide is sealed; and a pair of electrodes (32) which projects inside the discharge space (111), the electrodes arranged opposite each other at a prescribed distance. The ratio of indium halide contained in the metal halide (2) is 0.1 wt% - 0.33 wt%. Further, a dimension (d) that is the longest part of the discharge space (111) in the direction orthogonal to the direction in which the pair of electrodes (32) extends in the discharge space (111) is 1.5 mm - 2.3 mm.