Coupling device

A coupling device including a first rotating body and a second rotating body disposed coaxially with each other and rotatable relative to each other, the coupling device comprising:

• a spacer disposed between the first rotating body and the second rotating body;
• and
• a pressing member for performing pressing of at least one rotating body of the first rotating body and the second rotating body against the spacer, wherein
• the spacer includes an elastic member, and generates a frictional force between the spacer and the one rotating body when the pressing member performs the pressing,
• the one rotating body and the spacer are formed to have a configuration that allows the one rotating body to be idled with respect to the spacer or the spacer to be idled with respect to the one rotating body when torque larger than the frictional force acts between the one rotating body and the spacer, and
• a plurality of contact portions with which the one rotating body comes into contact and a plurality of portions with which the one rotating body does not come into contact are alternately provided on the spacer in a circumferential direction of the spacer.