A mixed-mode cavity filter is disclosed. The disclosed cavity filter includes: at least one first cavity configured to hold a metal coaxial resonator; and at least one second cavity configured to hold a dielectric resonator, where a first coupling window is formed in a wall formed between the first cavity and the second cavity, the first coupling window includes a horizontal window formed parallel to a bottom portion and a vertical window formed perpendicularly to the bottom portion, and the horizontal window and the vertical window overlap each other in at least a partial area. A mixed-mode filter according to an embodiment of the invention can achieve a small size and a light weight while providing low losses.