Provided is a lathe tool and chasing tool shape lathe using same, designed to be capable of performing machining functions of the lathe, without increasing the number of lathe tools and thereby to promote productivity of machining, curtailment of work handling, and reduction of equipment volume. The structure of the lathe tool (1) mounted on the blade carrier of the chasing tool shape lathe is: a plurality of blades (6) to be individually fixed to a shank (2) are formed by means of clamp means (10), and of the blades (6), at least one, for instance blade 6<-1> is structurally affixed to the base unit (4), which is installed on the side face or end face of the shank head portion (3). |