According to certain embodiments, an apparatus comprises: an upper case facing a first direction; a lower case facing a second direction opposite to the first direction, the lower case coupled to the upper case, thereby forming an internal space; a speaker module disposed in the internal space, wherein the speaker module includes: a speaker; a bracket surrounding at least a part of the speaker, the bracket comprising: a first opening positioned to receive sound generated from the speaker; at least one first part coupled with the upper case; and at least one second part coupled with the lower case; at least one first sealing member disposed on the at least one first part of the bracket and sealing the bracket and the upper case; and a second sealing member disposed on the at least one second part of the bracket and sealing the bracket and the lower case.