A power adapter device is to be applied to an electronic device, and includes a power adapter and a carrying pad. The power adapter includes a power adapter body, which has a pad-connecting end and a pad-storing end opposite to said pad-connecting end. The carrying pad has a free end, and an adapter-connecting end opposite to the free end and connected to the pad-connecting end. The carrying pad is switchable with respect to the power adapter body between an unfolded state, where the carrying pad is unfolded at one side of the power adapter body with the free end remote from the power adapter body, and a stored state, where the carrying pad is folded toward the power adapter body with the free end being close to the pad-storing end.