To provide disposable socks aiming at preventing and treating keratinization of the heel skin (crack of the heel).

The socks are made of a material such as polyethylene, polyester, nylon or vinyl, and structured as follows: a skinny air-impermeable layer sheet wraps whole the heel part (2) covering from the right and left end sides of the arch of the insole, and the right and left end parts of the skinny air- impermeable sheet are formed into a wrapping body so as to cover the foot through the arch part to the heal part and the heel part to top side to wrap whole of the heel part and cover the top part surface, the socks are worn inside hosiery at the outdoors, and singly worn indoors. Disposable treatment half socks for treating the keratinized heel are made by applying medicated materials on the surface of the air-impermeable layer getting in touch with the heel part of a wearer.