Multi-layered metal sheet

A multi-layered metal sheet formed of a laminate of a plurality of metal sheets, wherein

• the plurality of metal sheets are fixed to each other by a clinch formed in a concave shape on the multi-layered metal sheet from one main surface toward another main surface of the multi-layered metal sheet,
• the clinch formed in the concave shape has a schematic pillar shape, the clinch being defined by an open top, a pair of cut surfaces which are respectively formed from the open top toward a bottom and face each other, a pair of inclined surfaces which are respectively inclined from the open top toward the bottom and face each other, transitional surfaces disposed between the cut surfaces and sides of the inclined surfaces, and the bottom having overlapping parts which extend over the main surface of the multi-layered metal sheet on a lower side immediately below the cut surfaces, and
• lengthwise end portions of a cut formed in each of upper edge portions of the cut surfaces are disposed on upper edge portions of the transitional surfaces except for a boundary of a ridge which forms the upper edge portion of the cut surface.