The present invention relates to a dimmable AC driven-light emitting diode lighting device and, more particularly, to an AC driven-light emitting diode lighting device which represents a soft dimming characteristic in the entire section at a dimming level by using a triac dimmer configured to perform dimming control by using phase control. According to the present invention, the light emitting diode lighting device comprises: a dimmer for generating and outputting controlled AC power; a rectification unit for generating and outputting driving voltage; a dimming level detection unit for outputting a detected dimming level signal; a first light emitting diode group to n^th light emitting diode group (n is a positive integer which is greater than or equal to two) individually including one or more light emitting diodes; and a light emitting diode driving module for constant-current-controlling driving current of the light emitting diode.
