PURPOSE: An LED lighting device is provided to easily perform replacement of a LED and check the state of the LED with eyes. CONSTITUTION: A rectified flow power source and a rectified current are supplied to multiple LEDs. The multiple LEDs are serially connected. Multiple state displaying part(120) selectively provides a bypass path according to the voltage of both ends of the multiple LED. The multiple state displaying part includes a warning LED(123). The warning LED emits light by the current flowing in the bypass path. [Reference numerals] (122) Bypass controller
