An electronic device is provided, the electronic device including a housing including a side member comprising a side housing comprising a metal material; a display disposed in an inner space of the housing to be viewable through at least a portion of the housing; a mid plate disposed in the inner space and comprising a metal material; a waterproof member comprising an adhesive material disposed between a first portion of the mid plate and a second portion of the side member and facing the first portion; and a coating layer disposed between the first portion and the waterproof member.