POWER STORAGE ELEMENT

To provide a power storage element capable of saving space.SOLUTION: A power storage element 10 includes: an electrode body 600; and a current collector 500 connected to the electrode body 600. The electrode body 600 has: an electrode body main body 601; and a tab bundle 610 in which a plurality of tab portions 612, protruding from the electrode body main body 601, extending in an extending direction along the current collector 500, is laminated. The tab bundle 610 and the current collector 500 have a joint portion 700 joined to each other. The joint portion 700 includes: a first joint portion 710 in which a plurality of tab portions 612 is joined at different positions in the extension direction; and a second joint portion 720 in which at least one tab portion 612 of the tab portions 612 is not joined.SELECTED DRAWING: Figure 5 【課題】省スペース化を図ることができる蓄電素子を提供する。【解決手段】電極体６００と、電極体６００に接続される集電体５００とを備える蓄電素子１０であって、電極体６００は、電極体本体部６０１と、電極体本体部６０１から突出して集電体５００に沿う延設方向に延びる複数のタブ部６１２が積層されたタブ束６１０と、を有し、タブ束６１０と集電体５００とは、互いに接合された接合部７００を有し、接合部７００は、当該延設方向における異なる位置に、複数のタブ部６１２が接合された第一接合部７１０と、複数のタブ部６１２のうちの少なくとも１つのタブ部６１２が接合されていない第二接合部７２０と、を有する。【選択図】図５