A mobile electronic device is provided. The mobile electronic device includes a first component, a second component, a first space arranged to accommodate the first component, a second space arranged adjacent to the first space to accommodate the second component and communicate with outside of the mobile electronic device in a first direction, and having a side opened in a second direction perpendicular to the first direction, a housing comprising an isolation part for isolating the first space and the second space, and a sealing member arranged on the opened side of the second space. The isolation part includes a first isolation part formed of a metal material and a second isolation part coupled to the first isolation part and formed of an injection material.