An electronic device is disclosed. The electronic device includes a housing, a display, at least one through-hole, a speaker module, and an internal structure. The housing includes a front plate, a rear plate, and a side member. The display and the speaker module are disposed between the front plate and the rear plate. The through-hole is formed through the front plate between a portion of the side member and the display. The speaker module includes an acoustic generation surface facing the front plate near the through-hole. The internal structure is disposed between the front plate and the acoustic generation surface. The internal structure and the acoustic generation surface form a space, acoustically connected to the through-hole. The internal structure includes a surface facing the acoustic generation surface. The surface of the internal structure includes a plurality of areas, each with a different clearance from the acoustic generation surface.