To provide a cam device with excellent durability.

This cam device has freely rotatable cam-followers for making prescribed motion along a groove 10 formed of first and second side walls 11 and 12. The individually freely rotatable first and second cam-followers 21 and 22 are arranged in a pair, the axes L of the pair of cam-followers 21 and 22 are set so as to mutually become the same direction, the motion of the first cam-follower 21 is regulated by at least a part of the first side wall 11, and the motion of the second cam-follower 22 is regulated by at least a part of the second side wall 12.