According to various embodiments of the disclosure, an electronic device may include: a first housing, a second housing accommodating at least a portion of the first housing and configured to guide sliding movement of the first housing, a flexible display including a first display area disposed on the first housing and a second display area extending from the first display area, a speaker module including a speaker unit including at least one speaker disposed in the second housing and a speaker enclosure accommodating the speaker unit and including a vent hole, and a seal connected to the first housing and the speaker enclosure and configured to be variable based on the sliding movement of the first housing.