NOVELTY - The method involves providing a tank to have a fiber layer formed on an outer surface of a tank vessel (10) by winding reinforcement fibers e.g. carbon fibers (20), impregnated with thermosetting resin. Thermal curing process is performed for heating the vessel to thermally cure the resin for forming a fiber-reinforced resin layer and performing bubble removal process. State of the resin is detected, and details of the removal process are determined based on the detected state, where the thermal curing process allows the rotation of the tank vessel during heating at specified rotational speed.    USE - Method for manufacturing a high-pressure gas tank mounted on a moving body i.e. fuel cell vehicle.    ADVANTAGE - The method enables performing thermal curing process for heating the tank vessel to thermally cure the thermosetting resin for forming the fiber-reinforced resin layer, and performing the bubble removal process for preventing formation of air bubble in the fiber-reinforced resin layer at multiple different stages during the thermal curing process. The bubble removal process allows application of anti-foam in multiple stages at the adequate timings during the thermal curing process to enable only a small quantity of the anti-foam to exert the desired bubble removal effect, thus effectively preventing deterioration of strength of the fiber-reinforced resin layer by using the anti-foam and reducing the increase of manufacturing cost of the high-pressure gas tank. The method enables curing a resin component contained in the anti-foam applied on the surface, thus improving smoothness on the surface of the fiber-reinforced resin layer.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for an apparatus for manufacturing a high-pressure gas tank.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of a tank that is manufactured.    Tank vessel (10)    Cylinder section (11)    Dome sections (13)    Mouthpiece bases (14)    Carbon fibers (20)