A refrigerator comprising: a cabinet having storage space formed therein; at least one door configured to open and close the storage space; and a user detection sensor provided at the door and configured to detect a user located in front of the door, wherein the user detection sensor is inclined by a predetermined angle toward a center line of the door extending perpendicular to a width direction of the door; wherein the door comprises a front panel and a sensor space located at rear of a door front panel of the door, the user detection sensor disposed in the sensor space, wherein a sensor window is provided at the sensor space and facing the rear of the door front panel and wherein a front end of the user detection sensor faces the sensor window; wherein the door further comprises: - a first side guide rib and a second side guide rib provided inside the sensor space at positions corresponding to opposite ends of the sensor window, wherein the first side guide rib and the second side guide rib extend parallel to each other and are inclined with respect to the sensor window and are supporting the user detection sensor disposed thereinbetween; and - a first rear end support rib and a second rear end support rib formed at the sensor space at a surface opposite to the sensor window, wherein the first rear end support rib and the second rear end support rib support a rear end of the user detection sensor, and have protruding lengths different from each other. a cabinet having storage space formed therein; at least one door configured to open and close the storage space; and a user detection sensor provided at the door and configured to detect a user located in front of the door, wherein the user detection sensor is inclined by a predetermined angle toward a center line of the door extending perpendicular to a width direction of the door; wherein the door comprises a front panel and a sensor space located at rear of a door front panel of the door, the user detection sensor disposed in the sensor space, wherein a sensor window is provided at the sensor space and facing the rear of the door front panel and wherein a front end of the user detection sensor faces the sensor window; wherein the door further comprises: - a first side guide rib and a second side guide rib provided inside the sensor space at positions corresponding to opposite ends of the sensor window, wherein the first side guide rib and the second side guide rib extend parallel to each other and are inclined with respect to the sensor window and are supporting the user detection sensor disposed thereinbetween; and - a first rear end support rib and a second rear end support rib formed at the sensor space at a surface opposite to the sensor window, wherein the first rear end support rib and the second rear end support rib support a rear end of the user detection sensor, and have protruding lengths different from each other. - a first side guide rib and a second side guide rib provided inside the sensor space at positions corresponding to opposite ends of the sensor window, wherein the first side guide rib and the second side guide rib extend parallel to each other and are inclined with respect to the sensor window and are supporting the user detection sensor disposed thereinbetween; and - a first rear end support rib and a second rear end support rib formed at the sensor space at a surface opposite to the sensor window, wherein the first rear end support rib and the second rear end support rib support a rear end of the user detection sensor, and have protruding lengths different from each other.