Electricity storage device

The invention provides an electricity storage device which can prevent gas ejected from an electrode body in a housing from breaking through the housing and being released out of the housing. A power storage device (1) is provided with: an electrode body (30); a case (10) that accommodates the electrode body (30) therein; and a relief valve (25) which is provided in the housing (10) and which releases the gas GA generated inside the housing (10) to the outside of the housing (10). The electricity storage device (1) is provided with gas guide parts (40, 50) that guide the discharged gas GA toward the relief valve (25) when the gas GA is discharged from the electrode body (30). 本发明提供蓄电设备，能够抑制在外壳内从电极体喷出的气体冲破外壳而释放至外壳外。蓄电设备(1)具备：电极体(30)；外壳(10)，将该电极体(30)收纳于内部；以及安全阀(25)，设置于该外壳(10)，将在外壳(10)内产生的气体GA释放至外壳(10)外。并且，蓄电设备(1)具备在从电极体(30)喷出了气体GA的情况下将喷出的气体GA朝向安全阀(25)引导的气体引导部(40、50)。