PROBLEM TO BE SOLVED: To easily and inexpensively cope with a countermeasure of industrial waste regardless of size of a can and without enlarging a press by forming an annular thin step deference by the press on the peripheral edge part of an end sheet such as a bottom sheet and a top sheet of the can. SOLUTION: An end sheet 5 is placed on the top face of a bottom metal blade 17 of a bottom mold 13 and the end sheet 5 is positioned on the inside of a guide 16 and when a driving shaft 2 is moved downward, a step difference blade 25 is moved downward along the guide and the bottom face of the step difference blade 25 is positioned at the same face as the top face of the bottom metal blade 17 and the bottom face of the step difference blade 25 presses the peripheral edge part of the end sheet 5. In this instance, as the inner diameter r' is a little larger than the outer diameter r of the bottom metal blade 17, an annular thin step difference 6 is formed on the peripheral edge part of the end sheet 5 and the outer peripheral edge part of the end sheet 5 becomes a little lower than its inside. When a can with this end sheet 5 is discarded, a metal spatula is driven into the thin step difference 6 of the end sheet 5 to cut open the end sheet 5 along the step difference 6 to remove the end sheet 5 and this can is smashed.