The invention relates to a collapsible armrest device for stretchers comprising a support base intended to be coupled to the frame of a stretcher, a pair of armrest surfaces arranged on both sides of the support base, and a drive mechanism intended to move the two armrest surfaces from a first position to a second position, and fastening means intended to support the base support to the stretcher. Said drive mechanism has a parallelogram articulated mechanism that has a plurality of bars extending from the support base, which are rotatably articulated at one end to the support base while the opposite end is articulated to corresponding plates that are linked to the armrest surfaces, opposite bars being linked to a respective plate articulated to each other, such that the movement of the two plates is carried out in a synchronised manner.
