To provide a power tool capable of suppressing permanent deformation of an elastic member, and achieving a sustainable vibration reduction effect for a long time.

A ring rubber 25 as the elastic member is arranged between a wheel washer 22 attached to a spindle 17 and a substrate 12a of a diamond grinding wheel 12, and they are fixed by a lock nut 27 screwed to an end of the spindle 17, and thereby, vibration received by the diamond grinding wheel 12 in grinding work is absorbed by the ring rubber 25. An outer cylindrical part 23 is provided on an outer peripheral end of the wheel washer 22, and an inner cylindrical part 24 is provided on an inner peripheral end thereof. A cylindrical boss part 26 is disposed on an axis of the substrate 12a of the diamond grinding wheel 12. The boss part 26 is fitted between the outer cylindrical part 23 and the inner cylindrical part 24, and tilting of the diamond grinding wheel 12 is suppressed.