Support device (1) for a container enclosing a pneumatic life raft, comprising a support plate (2) and means (3) for stowing the container on the plate which comprises two separate bases (4) located opposite one another, in line with one another and at a distance from one another; the stowing means being able to comprise a rigid bar (5) of variable length extending from one base to the other by spanning the container with one end (6) articulated in rotation (11, 12) on a base (4a) and its other end (7) which may be fixed by releasable fixing means to the other base (4b); blocking means (8) blocking the container transversely to the bar; said support device may support containers of various dimensions.