A field litter support (1) includes two side structures (2, 3), each supporting at least one wheel (4) in order to define a frame (40), connecting devices (38a, 38b, 38c, 38d) for attaching a litter (100) to the frame (40), elements (5) adapted to reciprocally move the side structures (2, 3) and a mechanism (6) for blocking the elements (5), and therefore the structures (2, 3), in a predetermined position, attachable to the structures (2, 3). The structures (2, 3) are reciprocally moved close or away along the axis (60) of the wheels (4) without removing the frame (40). This characteristic, however, does not jeopardize the size, because, once the field litter support (1) has been packaged, it has a size equivalent to the one of the closed field litter supports of the prior art.