Electric storage device

In an electric storage device (10), lithium electrodes (17) are disposed on respective outermost portions of an electrode laminated unit (12) in which a positive electrode (13) and a negative electrode (14) are laminated alternately via positive/negative electrode separators (15). The lithium electrode (17) includes lithium metal (25) serving as a lithium ion supply source, and a lithium electrode separator (16) (a non-woven fabric separator) constituted by a non-woven fabric that satisfies the following conditions: (a) an average fiber diameter of 0.1 to 10 µm; and (b) a thickness of 5 to 500 µm is provided. By forming the lithium electrode separator (16) that contacts the lithium electrode (17) including the lithium ion supply source from a non-woven fabric in this manner, a dramatic improvement can be achieved in the cycle characteristic of the electric storage device (10).