Abstract: The present invention relates to a resonator and a filter using the same, and particularly, to a resonator, which includes partition walls that alternate vertically or horizontally in a cavity, and a filter using the resonator. The resonator includes: a housing which is made of a conductive material and includes a cavity; a cover which is made of a conductive material and fixed to an upper portion of the cavity, and seals the cavity; one or more first partition walls which are connected to one surface of inner surfaces of the cavity; and one or more second partition walls which are connected to the opposite surface to the one surface, in which the first partition walls and the second partition walls are made of a conductive material and have shapes corresponding to each other, and the first partition walls and the second partition walls alternate with each other.