To easily and accurately judge reaching to full charge, etc. at predetermined charging for charging an electric double layer capacitor.

A method for charge judging the electric double layer capacitor includes a step of monitoring the charging voltage of the electric double layer capacitor (12) to switch from a constant current charging to a constant voltage charging, a step of detecting the abrupt change of the charging current flowing to the electric double layer capacitor in the case of the constant voltage charging, and a step of judging by this change that the electric double layer capacitor arrives at the predetermined charging. An apparatus for charge judging the electric double layer capacitor includes a charging means (charging circuit 4) for constant current charging the electric double layer capacitor at the initial charging, and switching from the constant current charging to the constant voltage charging in response to the charging voltage of the electric double layer capacitor, and a judging means (voltage comparator 50) for detecting the abrupt charge of the charging current flowing to the electric double layer capacitor to judge that the electric double layer capacitor reaches the predetermined charged state by this change.