A lighting circuit which supplies current to a solid-state light-emitting element module (LED module) including: a solid-state light-emitting element (LED); a first input terminal connected to one end of the solid-state light-emitting element; a second input terminal connected to another end of the solid-state light-emitting element; and a rectifying element (diode) connected in inverse-parallel connection with the solid-state light-emitting element, includes; a power supplier that supplies current to the solid-state light-emitting element module selectively in one of a forward direction and a reverse direction of the solid-state light-emitting element; a voltage detector circuit that detects voltage that is applied between the first input terminal and the second input terminal, when the power supplier supplies current in the reverse direction of the solid-state light-emitting element; and a control circuit that controls an output current of the power supplier based on the result of the detection by the voltage detector circuit.