LID BODY AND SEALED BATTERY

Provided is a lid body including: a terminal member being mainly made up of a first metal; a sealing plate mainly made up of a second metal; and a sealing material. The sealing plate has a mounting hole for attaching the terminal member. The terminal member is inserted into the mounting hole and is attached to the sealing plate in a state where the sealing material is joined to a peripheral edge portion of the mounting hole. With as αa coefficient of linear expansion at 25° C. of the sealing material, αas a coefficient of linear expansion at 25° C. of the first metal and αas a coefficient of linear expansion at 25° C. of the second metal, α≤α≤αis satisfied, where αis the higher value and αis the lower value from among the αand α.