Bundling method, manufacturing method of battery, and bundling apparatus

A bundling apparatus configured to bundle a plurality of band-shaped parts of a current collecting tab in an electrode group in which the current collecting tab projects, the apparatus comprising:

• a bundling tool abuttable to the current collecting tab from an outer side in a lamination direction of the plurality of band-shaped parts;
• and
• a controller configured to move the bundling tool with the bundling tool being abutted to the current collecting tab and thereby configured to deform the current collecting tab, the controller being configured to control a moving of the bundling tool in such a manner that a moving direction of the bundling tool is inclined with respect to the lamination direction of the plurality of band-shaped parts, toward a side opposite to a side where the current collecting tab projects.