To easily construct a high quality layered product having rectangular cross section in a short time by forming a composite body of a curtain-like plate material and a second strip-like body after the curtain-like plate material is formed from a first strip-like body.

A negative electrode strip-like body adopted as a first strip-like body is formed by coating a paste 14 containing negative electrode active material on both sides of a strip-like copper foil 12. Similarly, a positive electrode strip-like body adopted as a second strip-like body is formed by coating a paste containing positive electrode active material on both sides of a strip-like aluminum foil 12. Moreover, the first strip-like body is divided into two equal parts in the longitudinal direction, and a curtain-like plate material for a curtain-like negative electrode having several sheet bodies is formed to insert the second strip-like body into the curtain-like plate material. After a composite body is formed by pinching the second strip-like body in the curtain-like plate material, a folded body of snake abdomen shape is formed by alternately folding the composite body to compact the folded body of snake abdomen shape. Thereby, a negative electrode plate 16 and a positive electrode plate 18 are alternately laminated so that a high quality layered product of rectangular cross section can be obtained in a short time.