To enable the execution of movement limitation of a tool support bed installed at a slanted slide, in an actual necessary movement limit regardless of an Y-axis position as an Y-axis function is obtained by combined movement.

A tool position control means 33 is provided to effect movement of a tool 7 in a direction Y, crossing orthogonally to a direction X extending along a slanted guide 3a, through combined movement of the movement motion of the slanted slide 3 and the movement motion of the tool support bed 4. The tool position control means 33 is provided to vary movement limits OT1 and OT2 of the tool support bed 4 in a direction X extending along an inclination direction according to the position of the tool support bed 4 in a direction Y extending orthogonally to the inclination direction.