A mobile electronic device comprising: a display panel comprising a plurality of layers including a front panel comprising a plurality of pixels, the plurality of layers further including a metal sheet layer including a first opening therein; a first printed circuit board extending from the front panel , wherein a portion of the first printed circuit board is disposed below the display panel , includes a display IC, and is electrically connected to the front panel ; a housing disposed below the front panel and having a second opening; a biometric sensor disposed below the front panel via the housing so that an upper surface of the biometric sensor is exposed to light through the second opening of the housing , and faces a rear surface of the front panel through the first opening of the metal sheet layer and the second opening of the housing ; and a second printed circuit board comprising a rigid part (641-1) and a flexible part (641-2), disposed below the biometric sensor and electrically coupled to the biometric sensor, the biometric sensor being attached to an upper surface of the rigid part (641-1) of the second printed circuit board by an adhesive, wherein a lower surface of the housing is attached to the upper surface of the rigid part (641-1) of the second printed circuit board by an adhesive, wherein the housing is configured to position the biometric sensor such that the upper surface of the biometric sensor is spaced apart from the rear surface of the front panel via an unoccupied space formed by the first opening of the metal sheet layer and the second opening of the housing , wherein the first printed circuit board includes a third opening in the portion disposed below the display panel such that the first printed circuit board does not overlap an area where the housing and the rigid part (641-1) of the second printed circuit board are disposed. a display panel comprising a plurality of layers including a front panel comprising a plurality of pixels, the plurality of layers further including a metal sheet layer including a first opening therein; a first printed circuit board extending from the front panel , wherein a portion of the first printed circuit board is disposed below the display panel , includes a display IC, and is electrically connected to the front panel ; a housing disposed below the front panel and having a second opening; a biometric sensor disposed below the front panel via the housing so that an upper surface of the biometric sensor is exposed to light through the second opening of the housing , and faces a rear surface of the front panel through the first opening of the metal sheet layer and the second opening of the housing ; and a second printed circuit board comprising a rigid part (641-1) and a flexible part (641-2), disposed below the biometric sensor and electrically coupled to the biometric sensor, the biometric sensor being attached to an upper surface of the rigid part (641-1) of the second printed circuit board by an adhesive, wherein a lower surface of the housing is attached to the upper surface of the rigid part (641-1) of the second printed circuit board by an adhesive, wherein the housing is configured to position the biometric sensor such that the upper surface of the biometric sensor is spaced apart from the rear surface of the front panel via an unoccupied space formed by the first opening of the metal sheet layer and the second opening of the housing , wherein the first printed circuit board includes a third opening in the portion disposed below the display panel such that the first printed circuit board does not overlap an area where the housing and the rigid part (641-1) of the second printed circuit board are disposed. <EOS>