To accurately and easily cut a workpiece at once by bundling a plurality of the workpieces without using a cutting device having a cutter, a vise or the like.

The workpiece cutting guide implement includes: a constant-length cubic plate-shaped body 2 having a width which allows a handy cutter C to be placed on the upper surface; a pair of leg bodies 3, 4 which are arranged at least at both end sides at the lower surface of the plate-shaped body 2, respectively; and gripping members 6 (6A, 6B) which are arranged at a part near the leg body 4 at one end side at the lower surface of the plate-shaped body 2, biased toward the other end side by a spring 5, and grip the workpiece W between the leg body 3 at the other end side and themselves. At the plate-shaped body 2, there is formed an oblong hole 7 into which a round saw t of the handy cutter C is inserted in the longitudinal direction of the plate-shaped body, and guiding standing walls 8 for guiding the handy cutter C are made to stand at edges of upper-face both sides.