To obtain a wall finishing material, in the cut edges of which no meadering develops, a wall paper starching machine slitter, which develops no meadering cut edges develops and a wall paper starching machine, which develops no meadering of the cut wall finishing material due to no meadering pulling-in develops irrespective of the thickness of the wall finishing material, the kind of the surface of the wall finishing material or the like.

The wall finishing material, at both the longitudinal end edge parts of which series of holes for a pin feed tractor mechanism are continuously provided, is employed. Further, as a wall paper starching machine equipped with a slitter main body and a slitting means, the starching machine equipped with a pair of pin feed tractor mechanisms for pulling the wall finishing material in the starching machine by being inserted in the connecting aperture for the pin feed tractor mechanism formed at both the side edges of the wall finishing material through a pulling-in port at both the side parts of the pulling-in port is employed.