To reduce the number of components by integrating a conventional multiobjective intake valve and the function of an auxiliary valve housing.

The recyclable intake valve for an oxygen breathing apparatus is provided with an internal member 31, an external member 32 and a valve housing 39.The internal member 31 is provided with a first valve 37 constituted to allow the inflow of external air to the interior but not to allow the outflow to the exterior.The valve housing 39 is provided with a second valve constituted to allow the inflow of air from the exterior but not to allow the outflow to the exterior, and a third valve constituted to release internal air to the exterior but not to allow the inflow of air to the interior from the exterior.The valve housing 39 is provided with a pipe stub 42 for connection to an oxygen reservoir, and a pipe stub 43 for the supply of oxygen.The external member 32 and the valve housing 39 are integrally formed.