To provide a resin seat frame and a molding method therefor capable of preventing damage to a mounting part and being constituted at a low cost.

In the resin seat frame 1 which bends by a load of a person sitting on a seat, mounting parts 5 of the seat frame 1 are constituted by continuously unifying them with a resin material the rigidity of which is higher than those of an upper face board 2 and a peripheral face board 3. For achieving this structure, two-color molding successively executing a frame molding process for molding the upper face board 2 and the peripheral face board 3 except the mounting part 5 of the seat frame 1 and a mounting part molding process for molding the mounting part 5 using a resin material the rigidity of which is higher than that of the resin material for the frame molding process, is executed.