To provide a tool in which water is prevented from intruding thereinto to provide a buoyancy.

The body 1 of this tool comprises a grip 10 processed by injection-molding a plastic, a molded groove 11 formed in the top part of the grip 10, and a hollow gas chamber 12 formed in the grip 10 by a thermoplastic hollow molding or a hollow injection molding through the molded groove 11 in a molding step. Since the gas chamber 12 is formed hollow and joined to the molded groove 11, air is fed into the gas chamber 12 through the molded groove 11. The body 1 comprises a drive body 20. A joint part 21 is formed at the end of the drive body 20. A slip preventer 22 is formed on the surface of the joint part 21. When the joint part 21 is fitted to the molded groove 11, the drive body 20 and the grip 10 are joined to each other, and encloses the air in the gas chamber 12. Since the enclosed air is subjected to the pressure of the joint part 21, the pressure in the gas chamber 12 is larger than the atmospheric pressure on the outside of the body 1. Consequently, since the tool is formed in a completely sealed structure, water is prevented from intruding thereinto.