Sealing member, energy storage device and method of manufacturing energy storage device

An energy storage device, comprising:

• a terminal which is provided on a case;
• a current collector which is electrically connected with the terminal;
• and
• a sealing member disposed between the terminal and the case or between the current collector and the case,
• wherein the sealing member comprises:
• a first surface which faces the case;
• and
• a second surface which is opposite to the first surface and faces the terminal or the current collector,
• wherein a first protrusion is formed on the first surface, the first protrusion surrounding a shaft portion of the terminal,
• wherein a second protrusion is formed on the second surface, the second protrusion surrounding the shaft portion of the terminal,
• wherein the first and second protrusions are disposed in a state where the sealing member is compressed between the terminal and the case or between the current collector and the case, and
• wherein, in a state before compression, in a stacking direction of the sealing member on the case and the current collector, a protrusion amount of the first protrusion is different from a protrusion amount of the second protrusion.