the sintered bearing material 11 from above and below in the axial direction in the outer periphery of the core rod 13 there is provided a master form 13 a see fig3 a having a configuration corresponding to the crowning portion 1 c of the finished product in this embodiment the master form 13 a exhibits a rounded curved surface expanding gradually and smoothly in opposite directions further the expanding amount of the rounded curved surface portion of the master form 13 a is approximately the same as the maximum radial drop amount u03b3 of the crowning portion 1 c to be shaped similarly the width in the axial direction of the rounded curved surface portion of the master form 13 a is set to be approximately the same as the axial length b 1 b 2 of the crowning portion 1 c to be shaped the upper punch 14 is fitted onto the outer periphery of the core rod 13 so as to be vertically axially slidable and the upper punch 14 moves up and down integrally with the core rod 13 the upper punch 14 and the core rod 13 can be raised and lowered by a common drive source or independent respective drive sources in this embodiment the lower punch 15 is raised and lowered by a driving means independent of or shared by the core rod 13 and the upper punch 14 and the die 12 is fixed to a stationary side member for.