There is provided an operating method of an AF detection device including a reference model construction step and a continuous detection step. In the reference model construction step, heartbeat waveforms of a PPG signal of a user are classified to construct a personal reference model. In the continuous detection step, current heartbeat waveforms of a PPG signal of the same user is compared with the personal reference model to identify whether each of the heartbeat waveforms is an AF waveform.
