JOINING DEVICE AND JOINING METHOD

A joining device includes a pair of cylindrical rotors 210 and 220, holding surfaces 211 and 221 of which for holding a pair of sheet-like members 30, respectively, have a width smaller than a width of the pair of sheet-like members 30. The joining device has a conveyance unit 200 which superimposes the pair of sheet-like members sequentially while conveying the pair of sheet-like members, by rotating the pair of cylindrical rotors, and joining units (first joining units 300) which join portions of the superimposed pair of sheet-like members to each other sequentially, the portions protruding beyond the holding surfaces of the cylindrical rotors.