ROTARY TOOL

PROBLEM TO BE SOLVED: To provide a rotary tool which can absorb a variation in machining reaction forces in different directions provided from a work thereto and can be reduced in size.SOLUTION: In this rotary tool 10, whether two faces compressing a compression deforming member 54 are the front end face 52F of a shaft outer surface recess 52 and the rear end face 51R of a cylinder inner surface recess 51 or the rear end face 52R of the shaft outer surface recess 52, and the front end face 51F of the cylinder inner surface recess 51 is switched according to whether a head 21 is moved forward or backward relative to a rotor connection part 12. In both the cases, the compression deforming member 54 is compressed and deformed. Namely, in the rotary tool 10, a variation in machining reaction forces in different directions provided from a work W thereto can be absorbed by the compression and deformation of the compression deforming member 54. Consequently, the rotary tool can be reduced in size compared with a conventional tool having two compression coil springs.