A wearable electronic device comprising: a front plate having a specific transparency; a display (920; 1020) under the front plate; a housing (906; 1006), at least a portion of which surrounds an edge of the front plate; a support member on which the front plate and the display are positioned; a rear plate on which the support member is positioned and coupled to the housing; and a fingerprint sensor, wherein at least part of the fingerprint sensor is disposed on a side of the front plate and under an edge of the housing and configured to receive light related to a fingerprint of a finger in contact with a specific area of the front plate and to receive fingerprint information from the fingerprint; a first reflector positioned at a location that is substantially symmetrical to the fingerprint sensor with respect to the front plate and configured to reflect light reflected by the fingerprint in contact with the specific area of the front plate; and a second reflector disposed to receive the light reflected by the first reflector after the light passes through the front plate and to direct the received light toward the fingerprint sensor; wherein the front plate includes: a first protrusion protruding towards the first reflector while having a first inclination angle; and a second protrusion protruding towards the second reflector while having a second inclination angle; wherein the first inclination angle and the second inclination angle are opposite to each other, the first reflector is attached to an inclined surface of the first protrusion, and the second reflector is attached to an inclined surface of the second protrusion. a front plate having a specific transparency; a display (920; 1020) under the front plate; a housing (906; 1006), at least a portion of which surrounds an edge of the front plate; a support member on which the front plate and the display are positioned; a rear plate on which the support member is positioned and coupled to the housing; and a fingerprint sensor, wherein at least part of the fingerprint sensor is disposed on a side of the front plate and under an edge of the housing and configured to receive light related to a fingerprint of a finger in contact with a specific area of the front plate and to receive fingerprint information from the fingerprint; a first reflector positioned at a location that is substantially symmetrical to the fingerprint sensor with respect to the front plate and configured to reflect light reflected by the fingerprint in contact with the specific area of the front plate; and a second reflector disposed to receive the light reflected by the first reflector after the light passes through the front plate and to direct the received light toward the fingerprint sensor; wherein the front plate includes: a first protrusion protruding towards the first reflector while having a first inclination angle; and a second protrusion protruding towards the second reflector while having a second inclination angle; wherein the first inclination angle and the second inclination angle are opposite to each other, the first reflector is attached to an inclined surface of the first protrusion, and the second reflector is attached to an inclined surface of the second protrusion. a first protrusion protruding towards the first reflector while having a first inclination angle; and a second protrusion protruding towards the second reflector while having a second inclination angle; wherein the first inclination angle and the second inclination angle are opposite to each other, the first reflector is attached to an inclined surface of the first protrusion, and the second reflector is attached to an inclined surface of the second protrusion.