To provide a hair perming method capable of reducing factors of damaging the hair and also effectively making a permanent, and to provide an apparatus used therefor.

The hair perming method includes: a step of dividing the hair into plural and winding it around rods; a step of inserting the rod to a case for pressurization, a step of injecting a liquid chemical through a check valve provided on one end side of the pressurization case; and a step of injecting a pressure gas in stages from an injection port on another end side of the pressurization case, and the liquid chemical impregnates and permeates the hair by the pressurization of the gas. In order to execute the method, the apparatus provided includes an openable and closable pressure case body in a cylindrical shape for freely detachably inserting the rod around which the hair divided into plural bunches is wound, the check valve provided on one end side in the longitudinal direction of the case body, the injection port provided on the other end side, a hair clamping part provided continuously on the longitudinal side face of the pressurization case in the cylindrical shape, and a weak adhesion member made of a resin provided in the hair clamping part.