Preparation and storage device of the storage device

Method for producing the electric storage device 100 according to the present invention includes a positive electrode 40, a negative electrode 50, a lithium ion source 30 having a plurality of portions 32, 34 which are arranged via a gap 36 in the winding direction, the wound, It includes the step of forming a wound body 20 having a flat portion 22 and curved portion 24, in the step of forming a wound body 20, the gap 36, so as to be positioned on the curved portion 24, to form a rolled body 20 .