To permit even a child and an old person to safely use blade tool for caring nails or the like by arranging an edge at the inner side of a ring shape, permitting an R-shaped ridge part and a blade surface to be tightly adhered to the nail or the like and executing chamfering.

This blade tool 1 is formed to be a hollow and cylindrical ring shape, the blade 2 is formed at the inner side of one end part in the ring shape, the R-shaped ridge part of the end part and the inner surface of the blade 2 are tightly adhered to the nail or the like and the tip part of the nail or the like is chamfered. Thus, the nail or the like is stably chamfered and the blade tool is utilized in a wide range such as a plastic molded part and metal in a wide range in addition to the nail. Besides, the ring-shaped blade surface 2 is not directly brought into contact with a hand or the like so that safety is drastically obtained.