Cam device for a press machine

In order to make easy to change the size of a cam device in the course of press mold design, there is provided a cam device (1) including: a cam holder (2); a cam slider (3); and a cam driver (4), wherein the cam devices (1) are grouped depending on the basis of width dimensions in combination of hardness of a sliding contact surface (2a) of the cam holder and a sliding contact surface (3a) on the cam slider (3) end, and hardness of a cam surface (4a) of the cam driver (4) and a cam surface (3b) of the cam slider (3), and the design structures of the respective groups are determined in such a manner that the maximum process ability in a certain group among the groups is larger than the minimum process ability of an adjacent group having a larger width dimension, and smaller than the maximum process ability in an adjacent group having a smaller width dimension.