A filter unit comprising: a filter which is configured to purify water; a filter head which is disposed on one end portion of the filter, and comprises an inlet port which is configured to supply raw water to the filter and is formed to protrude from one side thereof, and an outlet port which is configured to discharge pure water purified by the filter and is formed to protrude from the other side thereof; a filter housing which is formed with a filter accommodation space in which the filter is accommodated; a filter bracket which is coupled to the filter housing, and comprises an inlet port coupling part to which the inlet port is coupled rotatably, and an outlet port coupling part to which the outlet port is coupled rotatably; and a filter door which is coupled to the filter housing to open and close the filter accommodation space, wherein the filter housing comprises a front part, and a rear part which is disposed at a location where a lower plate thereof is lower than the front part, wherein the front part is formed with the filter accommodation space, and an opening which extends rearward from the filter accommodation space, wherein a part of the filter is disposed in the opening when the filter is accommodated in the filter accommodation space, wherein the filter door is disposed below the front part to cover the filter accommodation space and the opening, and wherein the filter bracket is disposed above the front part and the rear part to cover the rear end portion of the opening, wherein a first sliding mount, on which first sliding grooves that are configured to be coupled to a home appliance are formed at both sides thereof, is formed to protrude from the outside of the filter housing, and wherein a second sliding mount, on which second sliding grooves that are configured to be coupled to the home appliance are formed at both sides thereof, is formed to protrude from the outside of the filter bracket. a filter which is configured to purify water; a filter head which is disposed on one end portion of the filter, and comprises an inlet port which is configured to supply raw water to the filter and is formed to protrude from one side thereof, and an outlet port which is configured to discharge pure water purified by the filter and is formed to protrude from the other side thereof; a filter housing which is formed with a filter accommodation space in which the filter is accommodated; a filter bracket which is coupled to the filter housing, and comprises an inlet port coupling part to which the inlet port is coupled rotatably, and an outlet port coupling part to which the outlet port is coupled rotatably; and a filter door which is coupled to the filter housing to open and close the filter accommodation space, wherein the filter housing comprises a front part, and a rear part which is disposed at a location where a lower plate thereof is lower than the front part, wherein the front part is formed with the filter accommodation space, and an opening which extends rearward from the filter accommodation space, wherein a part of the filter is disposed in the opening when the filter is accommodated in the filter accommodation space, wherein the filter door is disposed below the front part to cover the filter accommodation space and the opening, and wherein the filter bracket is disposed above the front part and the rear part to cover the rear end portion of the opening, wherein a first sliding mount, on which first sliding grooves that are configured to be coupled to a home appliance are formed at both sides thereof, is formed to protrude from the outside of the filter housing, and wherein a second sliding mount, on which second sliding grooves that are configured to be coupled to the home appliance are formed at both sides thereof, is formed to protrude from the outside of the filter bracket.