Disclosed is an electronic device having a waterproof function. The electronic device includes a housing in which a coupling groove is formed, a cover including a hook detachably fit to the coupling groove, the cover configured to detachably couple to the housing by the hook, and a sealing band disposed on an inner side of the cover configured to contact at least a part of a surface of the housing which faces the cover when the cover is coupled to the housing, wherein the sealing band has a rib extending towards the housing, at least a part of the rib being bent in a specific direction. Other embodiments derived from the specification are possible.