A stowage device of emergency equipment for aircraft crewmember, the stowage device comprising a housing, the housing extends along a longitudinal direction and has side walls, a back wall and an opening opposite to the back wall, the side walls and the back wall define an internal space adapted to stow a respiratory mask in a stowage position, the side walls extend along the longitudinal direction up to a front edge delimiting the opening. One of the side walls is an adjustable wall. The housing comprises a frame and a movable element. The movable element is mounted on the frame and is movable between a retracted position and a protruding position. The movable element comprises a main movable panel and the adjustable wall includes the main movable panel.