In a head stock moving type automatic screw machine, a guide bushing including a frame therefor made in a hollow box shape, cutting tool rests disposed radially on the frame with work centrally positioned, a power source for the driving cutting tool rests being directly mounted on the frame for the guide bushing and means to permit at least two cutting rests opposedly disposed with the work centrally positioned to be driven in common with utilization of normal and inverse revolution of the motor and at the same time providing that several other cutting tool rests be driven in common by the motor output into another system encased in the same box-shaped frame; the automatic screw machine including numerical control arrangements for driving of the cutting tool rests.