According to an embodiment of the disclosure, an electronic device may include: a housing, a sliding plate configured to slide-out from the housing, a flexible display including a first section coupled to overlap the sliding plate, and a bendable section extending from the first section and configured to be pulled out from an inner space of the housing during the slide-out, a support sheet disposed on a rear surface of the flexible display, a first curved portion located inside the housing to correspond to the bendable section, a belt connecting the support sheet and the sliding plate to each other, and a second curved portion located inside the housing to correspond to the belt and spaced apart from the first curved portion in a slide-out direction.