Disclosed is a filter assembly including a filter cartridge including a housing, a filter provided inside the housing, and a cartridge connection portion provided at an upper portion of the housing, a head portion including a head connection portion to be coupled to the cartridge connection portion so that the filter cartridge can be attached and detached, a water inlet which introduces water to the filter cartridge, and a water outlet which discharges the water filtered by the filter cartridge, the head portion including a filter attaching and detaching lever which is movable between a first position, at which the head connection portion and the filter cartridge connection portion are coupled to each other, and a second position, at which the head connection portion and the filter cartridge connection portion are separated from each other, and can be supported by the head portion.