Gas supply device comprising a frame (2) housing a set of pressurized-fluid cylinders (3) linked to a fluid circuit (4, 5) for filling and emptying the cylinders (3), the support frame (2) comprising a lower base (34) on which the cylinders (3) rest vertically and a set of uprights (30) and cross beams (31, 32, 33) forming a cage with an overall parallelepiped shape to provide lateral support for the cylinders (3) arranged in several contiguous rows, characterized in that it includes at least one rigid reinforcement bar (6) for the frame (2) arranged between two rows of contiguous cylinders (3), said at least one reinforcement bar (6) resting simultaneously on the upper surface of the cylinders (3) in two rows of adjacent cylinders (3), the reinforcement bar (6) having two extremities connected rigidly and respectively to two opposing faces of the frame (2).