[Summary] [Object] To achieve an extended service life of LED by reducing a stress applied thereto. [Means for Settlexnent] Each of LED arrays 100a to 100x is made of a plurality of LEDs D1 to Dn connected in series from each other in a forward direction, and NPN transistors Qa to Qx and resistors Ra to Rx are connected to the LED arrays 100a to 100x connected in parallel from each other. Each base of the NPN transistors Qa to Qx is connected to a switch control part 41 of a control circuit 40, and lighting control signals with mutually shifted phases are supplied from the switch control part 41 to the respective bases. Sequential lighting of the LED arrays 100a to 100x is therefore achieved.
