PURPOSE: To improve the cut surface of a product having unevenness by manually or automatically moving a table in a cutting direction while guiding a thick-walled material by a guide means and passing the thick-walled material through the gap between a pair of the rotary blades rotated by a rotary device such as a motor to cut the same from above and below by the rotary blades.

CONSTITUTION: A tile is placed to be fixed by a press lock member. Subsequently, motors 28, 35 are driven not only to inwardly rotate rotary blades 2, 3 in a cutting part but also to rotate a screw rod 54. Since a half nut 46 is fed by the screw rod 54 by the rotation of the screw rod 54 to retreat, the table 4 integrated with the screw rod slowly retreats along a linear rail 51 and the tile is cut from above and below along a cutting line by the rotary blades 2, 3. By this constitution, the tile held by the retreat of the table can be cut from above and below by the rotary blades 2, 3.