To provide a lamp fitting for a vehicle that can make current of a predetermined variation ratio flow to each of a plurality of semi-conductor light emitting element units and can turn on/off each of the plurality of semi-conductor light emitting element units.

The lamp fitting for the vehicle comprises first and second semi-conductor light emitting element units connected mutually in parallel, a switching regulator transformer for supplying electric power to the first and second semi-conductor light emitting element units, a first secondary-side transformer for regulating the current variation ratio between a first power supply route from the switching regulator transformer to the first semi-conductor light emitting element unit and a second power supply route from the switching regulator transformer to the second semi-conductor light emitting element unit by magnetically interconnecting them, and a first switch section that is disposed at least on the first power supply route and controls whether or not power is supplied to the first semi-conductor light emitting element unit.