POWER STORAGE ELEMENT

This power storage element (10) is provided with: a container (100); an electrode terminal (300) having a terminal body (301), a shaft part (310), and a stepped part (305) disposed at the base of theshaft part (310); and an upper insulation member (350) disposed between the terminal body (301) and the container (100). The upper insulation member (350) has: a terminal support section (354) abutting a terminal bottom surface (306) of the stepped part (305); and a wall section (351) which faces an end surface of the terminal body (301). In one among the terminal body (301) and the upper insulation member (350), a protrusion (355) is formed which protrudes, at a location between the stepped part (305) and the wall section (351), toward the other among the terminal body (301) and the upper insulation member (350). On a lateral side of the protrusion (355), a gap (320) is formed between the terminal body (301) and the upper insulation member (350). 本发明提供一种蓄电元件。蓄电元件(10)具备：容器(100)；电极端子(300)，具有端子主体(301)、轴部(310)、以及配置在轴