A portable communication device or electronic device is provided. The communication device includes a housing including a first housing structure, a second housing structure, and a hinge cover positioned between at least a portion of the first housing structure and at least a portion of the second housing structure, a flexible display at least partially received in the housing and including a first portion corresponding to the first housing structure, a second portion corresponding to the second housing structure, and a third portion corresponding to the hinge cover, a hinge structure positioned between the third portion of the flexible display and the hinge cover and connected with the first housing structure and the second housing structure, and at least one sealing member positioned between the third portion of the flexible display and the hinge cover and contacting the hinge cover.