PURPOSE: To obtain a water purifier capable of preventing the recontamination of the water purified in the filtration part of the purifier at the purified water outlet due to the intrusion of bacteria, maintaining its effect and reducing the elution of an antibacterial agent into the purified water.

CONSTITUTION: This water purifier is provided with a filtration part for purifying raw water and a purified water outlet 6. An antibacterial fiber aggregate 4 holding an antibacterial agent contg. antibacterial metallic ion is arranged in a passage leading to the outlet 6 from the filtration part. Consequently, the intrusion of bacteria from the outlet and their propagation are prevented, a clear purified water free of bacteria, etc., is obtained, the antibacterial effect is maintained over a long period, and the elution of the antibacterial agent into the purified water is decreased.