A method for manufacturing a sealed battery (10) includes the steps of: measuring a voltage of the sealed battery (10) when a charging current of a predetermined value or more is caused to flow to the sealed battery (10) for a predetermined time after initial charging of the sealed battery (10); and determining whether a battery case (11) of the sealed battery (10) is damaged or not based on a change in the measured voltage. When an inclination of the voltage increases in a time change of the measured voltage, it may be determined that a recess (12) is present in the battery case (11) of the sealed battery (10).