PROBLEM TO BE SOLVED: To provide a reciprocation tool which is excellent in stability while reducing vibration of a handle transmitted from a main body.SOLUTION: In a reciprocation tool, a first protrusion part 10 protruding backward at the lower part of a main body 1 includes a spherical outer surface part 12. A rear handle 3 includes a spherical inner surface part 22a, 22b which is engaged with the spherical outer surface part 12. The spherical inner surface part 22a, 22b is concentric with the spherical outer surface part 12, and has a diameter substantially the same as that of the spherical outer surface part 12. The center of the spherical outer surface part 12 and the spherical inner surface part 22a, 22b becomes a fulcrum of oscillation of the handle 2 with respect to the main body 1. Since the spherical outer surface part 12 and the spherical inner surface part 22a, 22b are engaged with each other, the handle 2 is hardly moved with respect to the main body 1, for example, in a direction in which the handle 2 is separated forward or backward, and a direction in which the handle 2 is translated in vertical and horizontal directions.
