A filter structure, comprising: a housing body having an opening portion and a first accommodating space for accommodating a filtering member; a housing cap coupled to the opening portion of the housing body and having a second accommodating space, wherein a housing fastening portion is formed on an inner circumferential surface thereof; and a supporter accommodated in the second accommodating space and configured to be coupled to the accommodated filtering member and to an inner surface of the housing cap, the supporter including: a supporter accommodating portion configured to be coupled to the accommodated filtering member, a supporter stepped portion formed on the supporter accommodating portion, wherein a second filter inlet flow path is formed in the supporter stepped portion and configured to supply water in a space between the filtering member and the housing body, a supporter extending portion extending from the supporter stepped portion, wherein in the supporter extending portion, a first filter inlet flow path is formed on a centre portion thereof, the first filter inlet flow path communicating with the second filter inlet flow path of the supporter stepped portion, and a filter outlet flow path is formed on an outside of the first filter inlet flow path, and at least one projecting portion is formed on an upper portion of the first filter inlet flow path, and a supporter fastening portion configured to be coupled to the housing fastening portion for preventing a rotation of the supporter in the housing cap. a housing body having an opening portion and a first accommodating space for accommodating a filtering member; a housing cap coupled to the opening portion of the housing body and having a second accommodating space, wherein a housing fastening portion is formed on an inner circumferential surface thereof; and a supporter accommodated in the second accommodating space and configured to be coupled to the accommodated filtering member and to an inner surface of the housing cap, the supporter including: a supporter accommodating portion configured to be coupled to the accommodated filtering member, a supporter stepped portion formed on the supporter accommodating portion, wherein a second filter inlet flow path is formed in the supporter stepped portion and configured to supply water in a space between the filtering member and the housing body, a supporter extending portion extending from the supporter stepped portion, wherein in the supporter extending portion, a first filter inlet flow path is formed on a centre portion thereof, the first filter inlet flow path communicating with the second filter inlet flow path of the supporter stepped portion, and a filter outlet flow path is formed on an outside of the first filter inlet flow path, and at least one projecting portion is formed on an upper portion of the first filter inlet flow path, and a supporter fastening portion configured to be coupled to the housing fastening portion for preventing a rotation of the supporter in the housing cap. a supporter accommodating portion configured to be coupled to the accommodated filtering member, a supporter stepped portion formed on the supporter accommodating portion, wherein a second filter inlet flow path is formed in the supporter stepped portion and configured to supply water in a space between the filtering member and the housing body, a supporter extending portion extending from the supporter stepped portion, wherein in the supporter extending portion, a first filter inlet flow path is formed on a centre portion thereof, the first filter inlet flow path communicating with the second filter inlet flow path of the supporter stepped portion, and a filter outlet flow path is formed on an outside of the first filter inlet flow path, and at least one projecting portion is formed on an upper portion of the first filter inlet flow path, and a supporter fastening portion configured to be coupled to the housing fastening portion for preventing a rotation of the supporter in the housing cap.