Pulley, and window regulator comprising pulley

A pulley around which a wire is windable and which is rotatable about a rotation axis, the pulley comprising:

• a main winding portion including a first flange, a second flange, and a main winding groove in an annular shape formed between the first flange and the second flange, wherein the wire is windable around the main winding groove;
• and
• an auxiliary winding portion including the second flange, a third flange, and an auxiliary winding groove in an annular shape formed between the second flange and the third flange, wherein the wire is windable around the auxiliary winding groove, and the auxiliary winding groove has a total peripheral length shorter than that of the main winding groove,
• wherein:
• the auxiliary winding groove includes a closest portion that is closest to the main winding groove in a radial direction of the main winding groove,
• in a portion adjacent to the closest portion of the auxiliary winding groove, the auxiliary winding groove extends inward in the radial direction of the main winding groove as a distance from the closest portion increases,
• the auxiliary winding groove further includes a curved portion that is curved toward the main winding groove in the portion adjacent to the closest portion in such a way that the curved portion joins the main winding groove at the closest portion, and
• the third flange includes an auxiliary guide portion extending in a radial direction of the auxiliary winding groove in such a way that a groove depth of the curved portion becomes larger than a groove depth of the closest portion.