Abstract: A water purifier apparatus for removing the bleaching agent, the smell of an adhesive used in joining water pipes, and other impurities from water supplied through a water supply system. The water purifier apparatus includes a body having a raw water outlet, a cartridge disposed in the body and housing a filter material, the cartridge having a raw water inlet and a purified water outlet with an enclosed water passage extending therebetween, the raw water outlet and the raw water inlet being coupled to each other in a watertight manner. The cartridge is subject to repeated stresses due to application of water pressure, which varies as the flow of water is turned on and off and since the cartridge that is replaced in a relatively short period of time, the cartridge may be of a relatively small mechanical strength. The cartridge is fixedly positioned in the body by a cover, which is prevented from becoming broken or damaged by varying stresses since these stresses are borne instead by the cartridge.