Provided is a technology that can obtain an electricity storage device including a wound electrode body with high productivity. In an aspect of the electricity storage device disclosed herein, the separator 26 has a first adhesive layer 1A and a second adhesive layer 1B on at least one surface of the separator. In plan view of the separator 26, the first adhesive layer 1A is partially formed, and the second adhesive layer 1B is partially formed. The first adhesive layer 1A is composed of an adhesive layer that exhibits adhesiveness to the positive electrode 22 by contacting the positive electrode 22 facing the first adhesive layer 1A at ordinary temperature. The second adhesive layer 1B is composed of an adhesive layer that has no adhesiveness to the positive electrode 22 when the first adhesive layer 1A adheres to the facing positive electrode 22, and thereafter exhibits adhesiveness to the positive electrode 22 when some physical means is applied.