Power storage device and manufacturing method therefor

A power storage device, comprising:

• an electrode body;
• and
• a case housing the electrode body, wherein
• the case is provided with a case body member having an opening to house the electrode body and a lid closing the opening of the case body member, and having a first insertion hole penetrating through the lid in a thickwise direction,
• the power storage device includes:
• a current collecting member provided in the case to be electrically connected to the electrode body, the current collecting member including a hole circumferential portion that has a hole circumferential surface forming a second insertion hole;
• a terminal member including a terminal inserting portion of any one of a columnar shape and a cylindrical shape extending from outside to inside of the case, the terminal member including a swaged and deformed portion formed by swaging and deforming a part of the terminal inserting portion that has been inserted in the first insertion hole and the second insertion hole;
• a welded portion in which the hole circumferential portion of the current collecting member and the swaged and deformed portion of the terminal member are welded;
• and
• a first space which is surrounded by the welded portion, the hole circumferential surface, and the swaged and deformed portion, wherein the first space is provided toward the lid with respect to the welded portion, is adjacent to the welded portion and extends in a circumferential direction along the hole circumferential surface.