To provide an hyperbaric air chamber apparatus integrated owing to a structure in which air located at the upper part of the chamber is circulated to a circulation air path located at the lower part of the chamber to return high pressure air obtained by mixing, purifying, and cooling external air taken in and pressurized to the upper part of the chamber, thereby facilitating installation work, and provided with an air conditioner for purifying and cooling the pressurized air in order to secure comfortable use environment for a user.

Air in the chamber upper part 11 is fed to the circulation air path located at the chamber lower part by a circulation fan 14. The pressurized air taken in by a compressor 4 is introduced into an air mixing chamber 16 through an air compression/supply filter, and is mixed with circulation air 15. The high pressure air purified and cooled in an air conditioner 5 is returned to the chamber upper part 11 by a blower 52. Accordingly, the inside of the chamber upper part 11 is maintained in an environment in which the purified/cooled high pressure air flows.