Wiring module

A wiring module to be mounted on power storage elements having electrode terminals, the wiring module comprising:

• a flexible board to be electrically connected to the electrode terminals;
• a connector connected to the flexible board;
• and
• a casing holding the flexible board and the connector, wherein
• the casing includes
• a case body to be fixed to the power storage elements,
• a connector holder holding the connector, and
• a connection portion that is expandable and retractable in a first direction and connects the connector holder and the case body such that the connector holder is movable relative to the case body,
• wherein the case body, the connector holder, and the connection portion are monolithic,
• wherein the connection portion includes grooves extending in a second direction crossing the first direction and arranged side-by-side in the first direction,
• the connection portion includes first portions and second portions,
• the first portions having a thickness that is smaller than a thickness of the second portions, and
• wherein the first portions and the second portions are arranged alternately in the first direction, thereby forming the grooves, and
• the flexible board includes
• a board body section fixed to the case body, and
• an extra section extending from the board body section and having an end that is connected to the connector, and
• the extra section moves according to expansion and retraction of the connection portion and is longer than the connection portion, and the extra section is loosened when the connection portion is expanded to be longest.