Electrode lead wire member and battery

An electrode lead wire member comprising:

• a derivation portion consisting of metal and extending in one direction;
• a surface-treated layer formed, at said derivation portion, on a surface of said derivation portion;
• and
• a sealing film provided in contact with said surface-treated layer,
• wherein
• said sealing film has an adhesive resin layer in contact with said surface-treated layer,
• said adhesive resin layer contains modified polyolefin having a carbodiimide group,
• said surface-treated layer has an acidic group, and
• said modified polyolefin having a carbodiimide group is obtained by reacting polyolefin having a group reactive with a carbodiimide group and a carbodiimide group-containing compound in the presence of unmodified polyolefin.