To provide an electric double layer capacitor with shorter electrode portions that can secure insulation within a container.

The electric double layer capacitor 30 includes: a stack 15 including a plurality of thin positive electrode plates and thin negative electrode plates; an insulating pouch 31 storing the stack 15; a positive lead plate 11A in which lead terminals of the positive electrode plates are collected; a negative lead plate 12A in which lead terminals of the negative electrode plates are collected; a container 28 storing the pouch 31 in which the stack is stored; a sealing cap 21 sealing an opening of the container; electrode terminals 23 and 24 passing through the sealing cap 21 and fixed; and an insulating film 26 attached to the container 28 of the sealing cap 21. The electrode terminals 23 and 24 and the lead plates are connected, the insulating film 26 is adhered to the pouch 31 in a fluid-tight and air-tight state, the pouch 31 is stored in the container 28, and the opening of the container is sealed with the sealing cap 21.