To efficiently perform grooving work with a press while allowing more workpieces 1 to be arranged in a limited space by narrowing the space required to working per the workpiece 1.

This grooving press die has a fixed cylindrical guide 11 having a inner taper surface 12 the diameter of which is made small according as going to the side of the lower end at the upper end and a lower die 5 which is fit into the fixed guide 11 and slid in the direction of the center axis of the fixed guide 11. The flexible part 6 in the upper end part of the lower die 5 is made into a cylindrical shape so as to fit and hold a workpiece 1, this flexible part 6 has the outer tapered surface 9 the diameter of which is made small according as going to the side of the lower end which is fit into the inner tapered surface 12 of the fixed guide 11 and also the flexible part 6 is divided into a plurality of segments by vertical slits 8 so that the side of the upper end having the outer tapered surface 9 is deflected in the radial direction of the lower die 5. Further, a groove forming part 10 for forming the groove 4 on the outer periphery of the workpiece 1 is provided on the side of the inner periphery of the flexible part 6 of the lower die 5.