Disclosed is an electronic device including: a display, a speaker, an inner structure including a front surface on which the display is seated, a rear surface having a seating portion for the speaker formed thereon, and a side surface connecting the front surface and the rear surface, and a housing in which the inner structure is seated. The inner structure includes: a first space formed by indentation of a part of the bottom surface of the seating portion toward the front surface of the inner structure, a second space formed to be open toward the front surface of the inner structure such that the second space is connected to and partially overlaps with the first space in a direction defined toward the front surface of the inner structure, and a duct formed to be open toward the side surface of the inner structure such that the duct is connected to and partially overlaps with the second space in a direction defined toward the rear surface of the inner structure.