To prevent a leak of cleaning water by surely closing a gap between the opening of a face cover and the head of a person whose hair is being washed regardless of the size of the head of the person in washing hair using an automatic hair washing machine.

By inserting a rubber band in the outer periphery 1c and in the inner periphery 1b of a roughly rectangular vinyl sheet having an opening 1a big enough for a head to be inserted in its center, a waterproof sheet is made freely extensible and contractible. Velcro(R) tape 2 is provided at parts facing each other at the bottom of the inner periphery 1b for fixing the inner periphery 1b on a person whose hair is being washed.