above described embodiment in the above described embodiment and modification 1 the pressing heads 204 and 304 have shapes that enable them to fit firmly on the forming curved part 201 a of the forming die 201 while a pressing head 404 used in the curving work performed onto the end 11 b in the present modification does not have a curving shape corresponding to the shape of the forming curved part 201 a as shown in fig5 b when the pressing head 404 with such a shape is used it is required that the pressing head 404 acts such that the end 110 b of the positive electrode plate prototype 110 is entirely pressed onto the forming curved part 201 a of the forming die 201 without a gap therebetween in the curving work of the battery manufacturing method of the above described embodiment the forming die 201 including the forming curved part 201 a having a single curvature is used however the forming curved part 201 a of the forming die 201 does not necessarily have a single curvature but may have two or more curvatures namely a forming die including a curved part that has a plurality of curvatures may be used for the curving work also.