To provide a shield machine for a free cross section capable of excavating a free cross sectional shape while preventing the breakage and failure of copy cutters and spokes.

An inside boss 10 in the radial direction of the cutter head 2 is rotatably supported, a plurality of spokes 3a-3d are extended outward in the radial direction from the boss 10, and copy cutters 15, 16 are provided on the spokes 3a, 3c among the spokes 3a-3d respectively in this shield machine for the free cross section. The copy cutter 15 is a long copy cutter arranged so that part of it reaches the boss 10 of the cutter head 2.