A seat frame of a vehicle seat comprises a first frame part, a second frame part, a fitting which pivotally connects the first frame part with the second frame part about a swivel axis, a first fitting part of the fitting, which is connected with the first frame part, and a second fitting part of the fitting, which is connected with the second frame part, which for pivoting the first frame part and the second frame part relative to each other is adjustable with respect to the first fitting part. At least one of the first fitting part and the second fitting part has an annular collar surface extending around the swivel axis and pointing radially to the outside, via which the associated fitting part is connected with an annular bearing portion of the associated frame part, which delimits an opening.