Problem to be solved: to provide a method of manufacturing a high-pressure tank capable of maintaining the internal pressure of the high-pressure tank at a constant level without complicating the manufacturing equipment.A method of manufacturing a high-pressure tank 10 in which the outside of the liner 11 is covered with a fiber layer 14;The relief valve 20 is attached to the high-pressure tank before curingPressurizing the high-pressure tank (step S1) andA heating process for heating the high-pressure tank pressurized by the pressurizing process to cure the fibrous layer (step S2) andThe measuring process for measuring the internal pressure of the high-pressure tank after the heating step (step S3) andA judging process for determining whether the internal pressure of the high-pressure tank measured by the measurement step is within a predetermined range (step S4) andIs included.Diagram
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