An electronic device is provided. The electronic device includes a front plate, a back plate that faces away from the front plate, a side member including a frame structure that surrounds an inner space between the front plate and the back plate and a plate structure extending from the frame structure into the inner space, a display disposed between the plate structure and the front plate, a first speaker unit disposed in the inner space, at least part of the first speaker unit being supported by the plate structure, a first metal plate disposed between the plate structure and the display, and a sealing member that is disposed between the first metal plate and the display and that has a first opening portion formed on a side thereof. A first chamber is formed between the first speaker unit and the first metal plate, and a second chamber surrounded by the sealing member is formed between the first metal plate and the display. The second chamber and the first chamber are fluidly connected with each other by the first opening portion such that a first resonator structure corresponding to the first speaker unit is formed between the display and the plate structure.