To provide a manufacturing method of a lithium secondary battery suppressing wear of a jig when joining current collecting tabs at extremely small degree, and automatically assembling the current collecting tabs on a current collecting plate.

Positive electrode current collecting tabs 2 are put between a positive electrode current collecting plate 1 and a positive electrode ring 14 while being opened to the outside of a winding core 5, and the positive electrode current collecting plate 1 and the positive electrode ring 14 are joined by laser of a specified strength through the positive electrode current collecting tabs 2. Compressed air is used for opening the positive electrode current collecting tabs 2. The laser is made to have strength that does not melt a surface abutting on the positive electrode current collecting tabs 2 of the positive electrode ring 14 and a back surface in the opposite side.