Chemical reaction which occurs at the time of charging/discharging of the aluminum electrolytic capacitor gradually corrodes aluminum which consists the lead terminal. Because such a deteriorating factor of aluminum electrolytic capacitors affects the performance, duration, and reliability of devices, it is required to be least.

By applying resin coating on the round bar part of the lead terminal, the part is prevented from corrosion during electric charge/discharge, which contribute to the prevention of deterioration of aluminum electrolytic capacitors.