To provide the subject frame on which a sheet material for reinforcing a cloth can simply be disposed along the back side of a cap portion in its sewing range.

This headgear frame 1 of a sewing machine is provided with an approximately cylindrical receiving frame 2 which is inserted into the inside of a cap portion of the headgear to support the cap portion from the inside. A holding means for holding a sheet material S for reinforcing the sewing range of the cap portion from the inside is disposed in the front edge portion of the receiving frame 2. The holding means comprises plural dent portions 8a which are used for catching the rear edge portion of the sheet material S and are disposed in the front edge portion of the receiving frame 2.