In various example embodiments, an electronic device 300 may include: a housing 310 including a first housing 311 facing a first direction, and a second housing 312 facing a second direction opposite to the first direction; a sound module 340 disposed on a surface of the first housing 311 facing the second direction and configured to generate a sound; an acoustic duct 350 formed in the first housing 311 such that the sound module 340 and an outside of the electronic device 300 communicate with each other, and configured to transmit the sound generated by the sound module 340 to the outside of the electronic device 300; and a resonance structure 360 formed in the first housing 311 to communicate with the acoustic duct 350 to tune a resonance characteristic according to a shape of the acoustic duct 350.