An electronic device may include: a housing; a speaker provided inside the housing; an interposer board provided inside the housing, the interposer board including a first board, a second board spaced apart from the first board, and a side wall surrounding an internal space between the first board and the second board; and a sealing member provided between the speaker and the first board, wherein the first board may include at least one first through hole configured to transmit at least a portion of sound generated by the speaker to the internal space.