Water purifier-use cartridge

Provided is a water purifier-use cartridge which has a slim construction having a small outer diameter and yet has a favorable water-purifying function. The water purifier-use cartridge is provided with: a container body having a filter medium container and a cover section joined to an opening end side of the filter medium container; and a filter medium that is accommodated within the filter medium container. A water inlet and water outlet are provided to the cover section, and a first water channel communicating with the water inlet is formed in the outer side of the filter medium in the filter medium container. The filter medium is composed of molded activated carbon having a second water channel in the interior thereof, and a hollow fiber membrane configured so as to lead into the second water channel. The configuration is such that the molded activated carbon and the hollow fiber membrane are arranged along a central axis direction of the filter medium container, thereby causing water to flow from the fir