The present invention relates to a sterilization module, a water purifier, and a system comprising a water purifier. According to an embodiment, there is provided a sterilization module comprising: a flow channel body unit having a channel formed therein such that water passes through the same； an ultraviolet ray emission unit provided to emit ultraviolet rays towards the channel； a mounting unit, in which the ultraviolet ray emission unit is installed, the mounting unit being formed on the flow channel body unit such that an installation space, in which the ultraviolet ray emission unit is installed, and the channel are connected； and a holder coupled to the mounting unit so as to hold the ultraviolet ray emission unit inside the mounting unit.
