This separation wall (2) for an aircraft cabin comprises: a rigid and fixed vertical panel (24, 26, 28), a section (32) movable between an opened out position in which the movable section (32) projects beyond the contours of the rigid and fixed panel (24, 26, 28) and a retracted position in which the projecting portion of the movable section (32) is retracted at least partially in relation to the contours of the rigid and fixed panel (24, 26, 28).