To provide a tool with a hard part preventing come-out and improving durability by sticking or attaching a hard member directly to a working surface of the tool having the working surface brought into pressure contact with a workpiece engaging surface.

Diamond 1 of fine grain diameter of 50 μm or less is directly stuck to a bit part 4 at the tip of a rod part 6 of a screwdriver 3. Even if a screw for fastening the workpiece is an inferior product, the bit part 4 is inserted tightly into the groove by the diamond 1 to prevent come-out. Since the bit part 4 is covered with the hard member, high hardness is obtained to improve durability.