Abstract: A refrigerated container comprising a door composed of a first and a second door panels and a security device is disclosed. The security device includes a detection plate fixed to an inner side of the first door panel which has a free end extending towards the second door panel; a displacement sensor fixed to an inner side of the second door panel to cooperate with the free end of the detection plate; a monitoring module; and an antenna. Said displacement sensor, monitoring module and antenna are separately arranged in the door, and said monitoring module is arranged within a heat insulating layer in the first door panel or the second door panel, and said antenna is provided at an outer side of the first door panel or the second door panel.