A pressure container manufacturing method for manufacturing a pressure container by forming an outer shell made of a fiber reinforced composite material on a periphery of a liner, has: preparing a first fiber bundle which has a large diameter fiber bundle unimpregnated with a resin, and a second fiber bundle which has a small diameter resin bundle and a thermoplastic resin covering the small diameter resin bundle; forming a body on the periphery of the liner by braiding the first fiber bundle and the second fiber bundle with a braider; impregnating the first fiber bundle with the thermoplastic resin in the second fiber bundle which is heated and melted; and curing the thermoplastic resin to form the outer shell, wherein a tension applied to the first fiber bundle is larger than a tension applied to the second fiber bundle when forming the body and/or impregnating the thermoplastic resin.