To partially and beautifully dye hair for oneself by providing a water absorbing sheet for impregnating chemical agents such as hair dye, decolorizing material, on the inner side face of a two-foldable covering material and forming the covering material to be openable and closable.

At the time of constituting a hair partially dyeing tool 1 of a single body, the strip-like covering material 2 two-foldable in a longitudinal direction is formed from an impermeable material such as aluminum foil, synthetic resin sheet, and a rail-like openable/closable member 3 is fixed to an end edge in the longitudinal direction of the covering material to be formed openable/closable. The water absorbing sheet such as cotton, nonwoven fabric, a sponge sheet, is stuck to the inner side of the material 2. Chemical agent for dyeing hair is previously impregnated to the sponge sheet 4 or else, the agent for dyeing hair of a desired color is selected at the time of using and the agent is impregrated to the sponge sheet 4 to be used.