Bus bar and power storage module

A plate-shaped bus bar that connects a plurality of power storage elements to each other, the bus bar comprising:

• a plurality of connection portions to be connected to electrode terminals of the plurality of power storage elements;
• and
• one or more intermediate portions that couple the adjacent connection portions,
• wherein the connection portions include electrode welding portions that are respectively disposed so as to oppose the electrode terminals and are welded to the electrode terminals,
• the intermediate portion is provided with one or more slits,
• each slit has an elongated shape in an arrangement direction in which the connection portions are arranged side by side and has a predetermined dimension in a width direction orthogonal to both the arrangement direction and an opposing direction in which the electrode welding portions and the electrode terminals oppose each other,
• the intermediate portion is a raised portion that protrudes from the connection portions in a direction away from the electrode terminals,
• the bus bar includes a plurality of plate-shaped substrates laminated in the opposing direction,
• the substrates each include a protruding portion that forms the raised portion,
• a clearance is provided between the adjacent protruding portions, and
• the clearance includes a first clearance extending in the opposing direction and a second clearance extending in the arrangement direction.