To provide a rotary shank tool capable of fine precise adjustment of a cutting edge in the longitudinal direction of a guide groove and expansion of the adjustment range.

In a rotary shank tool having a body 12, a guide groove 17 in the body 12 and an axial adjustment part 26 disposed in an outlet of the guide groove 17 so that a longitudinally long cutting edge 18 can be disposed in the guide groove 17 and the cutting edge 18 can be axially adjusted by the axial adjustment part 26, at least one tension means 32 capable of moving axially the cutting edge 18 can be disposed to an end face 33 of the cutting edge 18 and adjusted by another tension means 36 got out of the moving direction of the tension means 32.