Method of manufacturing electricity storage device

A method of manufacturing an electricity storage device comprising a wound electrode body having a flat shape, the wound electrode body including a first electrode having a strip shape, a second electrode having a strip shape, and a separator having a strip shape, the first electrode and the second electrode being wound with the separator interposed therebetween, the method comprising the steps of:

• winding the first electrode and the second electrode with the separator interposed therebetween to produce a wound body;
• and
• after the winding step, pressing the wound body to form a wound electrode body having a flat shape,
• wherein
• the separator used in the winding step has a first adhesive layer and a second adhesive layer on at least one surface of the separator,
• in the winding step,
• the first adhesive layer and the first electrode adhere to each other, and
• the second adhesive layer and the first electrode adhere to each other with a force weaker than an adhesive force between the first adhesive layer and the first electrode, or the second adhesive layer and the first electrode do not adhere to each other, and
• in the pressing step,
• the second adhesive layer and the first electrode adhere to each other more strongly than in a state prior to the pressing step.