Provided is a lighting device, including: a circuit board in which light emitting elements are mounted to one surface of a supporting substrate; a substrate housing disposed to be spaced apart from another surface opposite to the one surface of the supporting substrate; and a distance regulating portion formed between the circuit board and the substrate housing to adjust a spaced distance between the circuit board and the substrate housing according to movement of the circuit board, wherein the distance regulating portion functions to fix the circuit board to the substrate housing via a fixing element formed in the circuit board and the substrate housing.