To provide a waterproof tool capable of perfectly protect from warm water for shampooing a head part in a sitting posture without the necessity of holding the tool by hand.

The tool is stereoscopically molded so as to go round along a hairline. The face ring 1 of a metallic aggregate and a nape part ring 2, which are divided in two, are integrated with play for the portion of the length of a connection shaft 5. When three connected parts are drawn with the use of the force of two rubber strings, the rings 1, 2 are contracted so as to intend to reduce the diameter until they are in close contact with the head part. When the waterproof tool is formed so that a waterproof part comprising a polyurethane-made face mat 11 and a skin adhesion part 12 molded from rubber, is integrally stuck onto the inner side of the rings, though a nape part is left as an opening part, a water flow from the head part is perfectly shut out and deviation and dropping off are not caused even when a neck is moved.