A journal foil air beating includes: a top foil located to face an outer circumferential surface of a rotating shaft and surround the rotating shaft; a bump foil being an elastically deformable member and located to surround the top foil; a base foil located to surround the bump foil, and a coupling unit configured to couple the first end portion of the top foil, the first end portion of the bump foil, the first end portion of the base foil, and the second end portion of the base foil, wherein the base foil, the bump foil, and the top foil are modularized into one piece by the coupling unit. According to the present invention, the journal foil air bearing may be easily assembled in advance and modularized into one piece, may be very conveniently mounted or disassembled on a bearing housing in a workplace.