To provide a digital flicker meter which can improve operability by shortening the wait time needed, until measurements become possible after its start.

This digital flicker meter digitally actualizes square detection to be performed, by passing an inputted power source signal of an object to be measured via a low-pass filter which performs squaring operation and deletes a doubled band of a fundamental wave and a high-pass filter which deletes DC components; and specific initialization processing, where an input waveform is specified and inputted is performed and then the squaring operation, the operation by the low-pass filter, and the operation by the high-pass filter, after the initialization processing have been performed in order from the head data to the tail data of respective digital data from the start position of a cycle made to correspond to the initialization processing.