A charge/discharge protection circuit for protecting a plurality of serially connected secondary batteries from overcharge, overdischarge, and current overflow by detecting overcharge, overdischarge, and current overflow and switching on/off a discharge controlling FET or a charge controlling FET according to the detection results is disclosed including an overcharge protecting circuit configured to prioritize the detection results corresponding to overcharge and switch off the charge controlling FET in a case where a charger is connected to the charge/discharge protection circuit.