PROBLEM TO BE SOLVED: To provide a can seam-fastening method, a first seam-fastening roll and a can seam-fastening device capable of preventing occurrence of thin chips during seam-fastening a can-top to a can barrel as well as maintaining an excellent seam-fastening performance at a curl part to secure an excellent sealability.SOLUTION: A first seam-fastening roll 50 comprises on outer peripheral surface thereof: an upper jaw part 51 arranged on upper side in an axial direction of the first seam-fastening roll 50; a lower jaw part 52 arranged on lower side in the axial direction; and a formation recess part 53 formed along a circumferential direction to form an outer peripheral surface of an entrainment part between the upper jaw part 51 and the lower jaw part 52. In an entrainment process, a position S between a curl part 14 and the formation recess part 53 is provided on an outer side of a perpendicular line Z, which is a line including the most outside peripheral position of the lower jaw part 52 in parallel to the axial line of the first seam-fastening roll 50, in a radial direction of the first seam-fastening roll 50.SELECTED DRAWING: Figure 4
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