An aerator device comprising: a housing having an inner cavity defined therein, the housing including at least one sidewall and an upper surface connected to the at least one sidewall; a first partition formed within the inner cavity and extending from an upper end to a lower end to define a first cavity and a second cavity; and a second partition formed between the first partition and a first sidewall within the inner cavity and extending from an upper end to a lower end to define a first chamber and a second chamber of the second cavity, and a third partition connecting the lower end of the first partition to the first sidewall, the third partition being separated from the lower end of the second partition to form a second opening, through which the first chamber and the second chamber communicate with each other, wherein the housing comprises an inlet opening communicating with the first cavity and an outlet opening communicating with the second chamber, the first partition is separated at the upper end thereof from the upper surface of the housing to form a first opening, through which the first cavity and the second cavity communicate with each other, the upper end of the second partition is connected to the upper surface of the housing, the first chamber and the second chamber being in communication with each other below the lower end of the second partition, and the second chamber is gradually narrowed towards the upper surface of the housing, wherein the second chamber comprises: the second partition and the first sidewall facing each other; and a pair of second opposite sub-sidewalls (124A, 124B) connecting the second partition and the first sidewall, and wherein an upper area A1 defined by the upper end of the second partition, the first sidewall and the pair of second opposite sub-sidewalls (124A, 124B) is smaller than a lower area A2 defined by the lower end of the second partition, the first sidewall and the pair of second opposite sub-sidewalls (124A, 124B). a housing having an inner cavity defined therein, the housing including at least one sidewall and an upper surface connected to the at least one sidewall; a first partition formed within the inner cavity and extending from an upper end to a lower end to define a first cavity and a second cavity; and a second partition formed between the first partition and a first sidewall within the inner cavity and extending from an upper end to a lower end to define a first chamber and a second chamber of the second cavity, and a third partition connecting the lower end of the first partition to the first sidewall, the third partition being separated from the lower end of the second partition to form a second opening, through which the first chamber and the second chamber communicate with each other, wherein the housing comprises an inlet opening communicating with the first cavity and an outlet opening communicating with the second chamber, the first partition is separated at the upper end thereof from the upper surface of the housing to form a first opening, through which the first cavity and the second cavity communicate with each other, the upper end of the second partition is connected to the upper surface of the housing, the first chamber and the second chamber being in communication with each other below the lower end of the second partition, and the second chamber is gradually narrowed towards the upper surface of the housing, wherein the second chamber comprises: the second partition and the first sidewall facing each other; and a pair of second opposite sub-sidewalls (124A, 124B) connecting the second partition and the first sidewall, and wherein an upper area A1 defined by the upper end of the second partition, the first sidewall and the pair of second opposite sub-sidewalls (124A, 124B) is smaller than a lower area A2 defined by the lower end of the second partition, the first sidewall and the pair of second opposite sub-sidewalls (124A, 124B).