There is provided a vehicular lamp that can flow an electric current having a predetermined variation ratio into each of a plurality of semiconductor light-emitting element units and can individually illuminate each of the plurality of semiconductor light-emitting element units. The vehicular lamp includes a first and a second semiconductor light-emitting element units that are connected to each other in parallel, a switching regulator transformer operable to supply electric power to the first and the second semiconductor light-emitting element units, a first secondary side transformer that magnetically couples a first power supply path from the switching regulator transformer to the first semiconductor light-emitting element unit and a second power supply path from the switching regulator transformer to the second semiconductor light-emitting element unit in order to regulate a current variation ratio between these paths, and a first switch operable to control whether the power is supplied to the first semiconductor light-emitting element unit, in which the first switch is provided at least on the first power supply path.