To solve the problem with a known roller gear cam that it is very difficult to be machined and requires a special machine or jig for machining, resulting in high manufacturing costs of the roller gear cam.

Driven rollers 6 each having a roller shaft 6A rotatably journaled by a ring bearing 6B are journaled in predetermined radially spaced relationship on the outer peripheral edge of a driven articulated spider 3 provided on a driven shaft 2, and a cam 5 formed in a driveshaft 4 has inclined faces 5b and 5c formed at both sides of one end thereof, the inclined faces diverging toward the driveshaft 4. The cam 5 is provided around the periphery of the driveshaft 4 so that it can feed the driven rollers 6 one at a time.