Fastening tool and method of producing fastened product

A fastening tool for fastening a nut to a bolt by rotating the nut, comprising:

• a pipe having a socket wrench formed at one end portion of the pipe, a detachable structure formed at an other end portion of the pipe, and a suction port formed on a side portion of the pipe between the one end portion and the other end portion;
• and
• a coupler having a flow path, a first coupling portion that couples the coupler to a casing of a rotational drive device, and a second coupling portion that couples the coupler to a duct of an ejector such that the suction port of the pipe is positioned to be connected to the flow path of the coupler,
• wherein the socket wrench is configured to insert and rotate a nut, the detachable structure has at least one of a thread, a detachable coupler and a column and configured to attach to and detach from a rotor of the rotational drive device having the rotor, a motor configured to rotate the rotor, and the casing housing the rotor and the motor such that the rotor is configured to rotate the pipe, the flow path is configured to suction a piece of the nut broken by a specified torque from the suction port of the pipe rotating with torque generated by the rotational drive device, the detachable structure comprises an external thread configured to be attached to and detached from an internal thread formed in the rotor of the rotational drive device, and the coupler includes a third coupling portion that couples the coupler to the pipe such that the third coupling portion rotatably holds the pipe rotated by the rotational drive device.