An electronic device according to various embodiments of the present disclosure may comprise: a housing including a front plate facing forward and a rear plate facing rearward; a display assembly comprising a display visible through at least a portion of the front plate and which includes an upper portion, a lower portion overlapping at least a partial region of the upper assembly and that includes a first opening, and a flexible circuit board overlapping at least a partial region of the lower portion and that includes a second opening corresponding to at least a portion of the first opening; a photosensor module including a sensing unit comprising a sensor corresponding to at least a portion of the second opening, and a plurality of pads arranged to be adjacent to the sensing unit and electrically coupled to the flexible circuit board; and an electrical component and/or mechanical structure arranged between the photosensor module and the rear plate and spaced from the photosensor module at a first distance.