PORTABLE ELECTRONIC DEVICE

A portable electronic device is provided. The portable electronic device comprises a housing including a first opening formed through a side wall of the housing and a second opening formed through the side wall; a tray structure detachably coupled to the housing through the first opening; and a sealing member comprising: an extending portion at least partially inserted into the second opening, the extending portion including a first end and a second end opposite to the first end; at least one first sealing portion disposed on an outer periphery of the extending portion between the first end and the second end, the at least one first sealing portion configured to seal a gap between an inner periphery of the second opening and the outer periphery of the extending portion; and a stopping portion formed at the second end and disposed in the housing, wherein the stopping portion is configured to interfere with an inner surface of the side wall in order to prevent the extending portion from separating from the housing through the second opening.