An electronic device includes a housing including a first surface, a second surface, and a third surface defining an internal space of the housing, a touch screen display interposed between the first surface and the second surface, and a sensor module disposed under the touch screen display and including a light emitting unit and a light receiving unit, wherein the third surface includes a plurality of through holes each including optical structures, wherein a portion of light emitted from the light emitting unit is guided to an exterior of the electronic device through a first optical structure of a first through hole, and wherein at least a portion of light introduced from the exterior of the electronic device is guided to the light receiving unit on a second optical structure of a second through hole.