Provided is a shot processing device in which the positions of respective insertion holes of a plurality of guide cylinders can be aligned easily and in which the shaking and bending of a wire material caused by projection can be suppressed effectively. First guide cylinders 70, 72, 74 are arranged on both sides sandwiching respective projection areas A1, A2, A3. Second guide cylinders 80 are arranged on both sides sandwiching the projection area A2. A wire material W is inserted through the first guide cylinders 70, 72, 74 and the second guide cylinders 80 so as to penetrate the same in a transporting direction of the wire material W. First insertion holes 70A, 72A, 74A of the respective first guide cylinders 70, 72, 74 and second insertion holes 80A of the respective second guide cylinders 80 are each gradually reduced in diameter toward the downstream side in the transporting direction. The second guide cylinder 80 is provided in a state such that the end part thereof on the downstream side in the transporting direction is inserted in the first insertion hole 72A from the inlet side of the first guide cylinder 72.