Abstract: A portable hair washer permits hair washing of patients who cannot move freely, regardless of the state of the patients or the environment where the patients are located. The portable hair washer includes: a shampoo bowl of depressed shape; a head mounting portion curved to support a patient's head on a side of the shampoo bowl; a reservoir portion separated from the shampoo bowl by a side wall to store water; a drainage portion separated from the reservoir portion by a separation wall to store used water from the shampoo bowl; a water supply portion disposed on a side of the reservoir portion to supply water to the reservoir portion; a shower disposed on a side of the reservoir portion to supply the water to the shampoo bowl; and a pump providing the shower with a driving force to draw the water.