Snap ring, rotator device, fixing device, and image forming apparatus

A snap ring configured to be set to a set portion of a shaft of a rotator from a direction orthogonal to an axial direction of the shaft, the snap ring comprising:

• a snap ring body that includes a first arcuate portion and a second arcuate portion, the first arcuate portion and the second arcuate portion facing each other, being elastically deformable in directions away from each other, and being configured to hold the set portion by elastic deformation restoring force, the snap ring body having one end of the first arcuate portion and one end of the second arcuate portion that are away from each other to form an insertion portion to insert the set portion;
• a first guide extending from the one end of the first arcuate portion forming the insertion portion, in a radially outward direction of the first arcuate portion and a direction inclined with respect to an insertion direction in which the set portion is inserted into the snap ring;
• and
• a second guide extending from the one end of the second arcuate portion forming the insertion portion, in a radially outward direction of the second arcuate portion and a direction inclined with respect to the insertion direction in which the set portion is inserted into the snap ring.