Secondary battery

A secondary battery comprising:

• an outer package member;
• a battery device contained inside the outer package member;
• an electrode terminal disposed on an outer side of the outer package member;
• and
• an adhesive member having an insulating property and disposed between the electrode terminal and the outer package member, wherein
• the outer package member includes
• a container part having an opening and containing the battery device inside, and
• a cover part closing the opening and joined to the container part,
• a portion or all of a peripheral end part of the electrode terminal is adhered to the cover part via the adhesive member, and
• the electrode terminal has a thickness greater than a thickness of the cover part,
• wherein the cover part includes a recessed part,
• wherein at the recessed part, the cover part is bent so as to be partly recessed toward an inside of the container part, and
• wherein the electrode terminal is disposed inside the recessed part.