WOUND ELECTRODE ASSEMBLY

In a wound electrode assembly, a first electrode and a second electrode having a different polarity from the first electrode are wound in a flat shape with a separator interposed between the first electrode and the second electrode. The wound electrode assembly includes: a first resin member wound around a winding axis; and a second resin member wound around the winding axis along the first resin member on the inner side of the first resin member. The linear expansion coefficient of the first resin member is greater than the linear expansion coefficient of the second resin member.