TERMINAL LEAD

A terminal lead includes an inner end portion to be arranged inwardly of an exterior casing which accommodates an electrochemistry element , an outer end portion to be arranged outwardly of the exterior casing , and a plate-shaped metallic substrate as a base material. An insulating resin film is arranged at a portion of the terminal lead corresponding to a seal portion of the exterior casing . In this terminal lead , a surface coating layer is formed on both surfaces and of the metallic substrate in a thickness direction thereof. A coated amount of both widthwise end portions and of the surface coating layer formed on both surfaces and of the metallic substrate in the thickness direction is less than that a widthwise intermediate portion thereof.