To allow effective utilization of air having high oxygen concentration, and to allow easy utilization of the high concentration oxygen to a body, beauty or the like by various means and a plurality of persons while enjoying.

The oxygen supply apparatus includes: an oxygen supply part 2 discharging air having the high oxygen concentration; a purification part 7 connected to a discharge port 4, and purifying air by a filter; a check valve 11 connected to the purification part 7; and a plurality of connection outflow ports 14. The oxygen supply apparatus also includes a branch changeover part 12 including a changeover operation part 15 which selects each connection outflow port 14 and allows opening/closing. Each of the respective connection outflow ports 14 is installed with the one selected from a sucking spout tube 20A for performing suction from a nostril or the like, a drinking bubble spout tube 20B spouting air into drinking water inside a bottle 33, a bath bubble spout tube 20C spouting air into hot water inside a bathtub 35, and an air spout tube 20D spouting air to a hood part 37 covering a face F or the like.