PURPOSE: To provide an angle allocation cam mechanism which is easily and inexpensively manufactured, wherein torque of an input shaft is properly transmitted to an output shaft.

CONSTITUTION: An angle allocation cam mechanism is constructed such that a plurality of rollers 5 spirally arranged around a roller holding body 4 connected to an output shaft 3 are slidingly connected with a worm cam 7 formed around an input shaft 10, and thereby torque of the input shaft 10 is transmitted to the output shaft 3. A cam lead 7b is spirally formed on substantially all of the circumference of the worm cam 7 for slidingly connecting with only one of the rollers 5.