A power storage device includes a plurality of power storage units which are stacked and disposed in a predetermined direction, a plurality of terminal portions which are provided in the plurality of power storage units, and a plurality of conductive members which extend in the predetermined direction along the plurality of power storage units and are connected to the plurality of terminal portions. Each of the plurality of conductive members includes a connection portion attached to the terminal portion, a main body portion provided integrally with the connection portion, and an electrically insulating coating covering a surface of the main body portion. In each of the plurality of conductive members, a length of the connection portion in the predetermined direction is formed to change with a trend of increasing as a length of the main body portion in the predetermined direction increases.