PURPOSE:To obtain the small-sized titled device having a simple structure at a low cost by closely contact-fixing the rear surface of a tool rest onto the front surface of a ram when the ram is lowered by the swing of a cam body and separating a cutter from a workpiece by forwardly tilting the tool rest when the ram rises. CONSTITUTION:A cam body 30 is revolved in the clockwise direction by the frictional force between a guide surface 31, and the eccentric surface 32 of a shaft 24 presses a tool rest 25 onto a ram 11, and said tool rest 25 is fixed onto the ram 11. When the ram 11 is lowered further, the cam body 30 slidingly moves on a guide surface 31, and maintains the tool rest in the fixed state onto the ram 11, and a cutter 29 carries out cutting work for a workpiece 33. When the ram 11 starts to rise, the cam body 30 is revolved in the counterclockwise direction by the frictional force between the guide surface 31, and the eccentric surface 32 separates the tool rest 25 from the ram 11, and the tool rest 25 is tilted forward by the gravity, and the cutter 29 is separated from the workpiece 33. When the ram 11 rises further, the cam body 30 slidingly moves on the guide surface 31, and the tool rest 25 is kept in the forwardly tilted state, and the cutter 29 is returned upwardly without contacting the workpiece 33.
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