A manufacturing method of a trim cover surface material, includes: providing a jig including a first frame configured to hold an outer periphery of an outer material and a second frame configured to hold an outer periphery of a wadding material by overlapping the wadding material on the outer material which is held by the first frame; holding the outer periphery of the outer material with the first frame of the jig; forming through holes at the outer material which is held by the jig; holding the outer periphery of the wadding material with the second frame of the jig while the outer material is held by the first frame of the jig; and forming stitches at the outer material and the wadding material which are overlapped and held by the jig.