A refrigerator comprising: a cabinet configured to define a storage space; and a door configured to open and close the storage space, wherein the door comprises a door body, and a panel assembly detachably mounted to the door body and configured to define a front surface of the door; wherein the door body comprises: a front plate, a door liner configured to define a rear surface of the door, and a cap decor (42, 44) connected to the door liner and to the front plate wherein a space is defined between the door liner, the front plate and the cap decor (42, 44) for an insulator to be filled therein; and wherein the panel assembly comprises: a panel configured to define the front surface of the door; and an insertion protrusion (542, 1542) protruding from the panel towards the door body and configured to be detachably inserted into a protrusion insertion hole (426, 1426), characterized in that the protrusion insertion hole (426,1426) is a protrusion insertion hole of a front surface of the cap decor (42, 44) for restricting the panel assembly when the panel is mounted to the door body, wherein the insertion protrusion (542, 1542) when inserted into the front surface of the cap decor (42, 44) extends in forward-rearward direction and at least a part of the insertion protrusion (542, 1542) is disposed below the recessed space, and the cap decor (42,44) having a recessed space forming a handle for the door. a cabinet configured to define a storage space; and a door configured to open and close the storage space, wherein the door comprises a door body, and a panel assembly detachably mounted to the door body and configured to define a front surface of the door; wherein the door body comprises: a front plate, a door liner configured to define a rear surface of the door, and a cap decor (42, 44) connected to the door liner and to the front plate wherein a space is defined between the door liner, the front plate and the cap decor (42, 44) for an insulator to be filled therein; and a front plate, a door liner configured to define a rear surface of the door, and a cap decor (42, 44) connected to the door liner and to the front plate wherein a space is defined between the door liner, the front plate and the cap decor (42, 44) for an insulator to be filled therein; and wherein the panel assembly comprises: a panel configured to define the front surface of the door; and an insertion protrusion (542, 1542) protruding from the panel towards the door body and configured to be detachably inserted into a protrusion insertion hole (426, 1426), characterized in that the protrusion insertion hole (426,1426) is a protrusion insertion hole of a front surface of the cap decor (42, 44) for restricting the panel assembly when the panel is mounted to the door body, wherein the insertion protrusion (542, 1542) when inserted into the front surface of the cap decor (42, 44) extends in forward-rearward direction and at least a part of the insertion protrusion (542, 1542) is disposed below the recessed space, and the cap decor (42,44) having a recessed space forming a handle for the door. a panel configured to define the front surface of the door; and an insertion protrusion (542, 1542) protruding from the panel towards the door body and configured to be detachably inserted into a protrusion insertion hole (426, 1426), characterized in that the protrusion insertion hole (426,1426) is a protrusion insertion hole of a front surface of the cap decor (42, 44) for restricting the panel assembly when the panel is mounted to the door body, wherein the insertion protrusion (542, 1542) when inserted into the front surface of the cap decor (42, 44) extends in forward-rearward direction and at least a part of the insertion protrusion (542, 1542) is disposed below the recessed space, and the cap decor (42,44) having a recessed space forming a handle for the door.