PROBLEM TO BE SOLVED: To provide a manufacturing method of a high-pressure tank which can reduce a strep between a liquid gasket and liners without pushing the liquid gasket into a clearance of boundary portions between the liners and mouthpieces by using a spatula and a brush.;SOLUTION: A manufacturing method of a high-pressure tank having a liner 10 composed of a cylindrical hollow vessel, a first mouthpiece 21 and a second mouthpiece 22 which are attached to a mouthpiece attachment part 15 as opening parts of the liner 10 includes: a step for preparing a first liner 11 and a second liner 12 in which the first mouthpiece 21 and the second mouthpiece 22 are arranged at the mouthpiece attachment part 15 (step S1); a step for heating the vicinity of a boundary portion between the first liner 11 and the first mouthpiece 21, and the vicinity of a boundary portion between the second liner 12 and the second mouthpiece 22 (step S3); a step for applying the liquid gasket to the vicinities of the boundary portions (step S4); and a step for cooling at least either of the liner 10 and the first and second mouthpieces 21, 22 (step S5).;SELECTED DRAWING: Figure 3;COPYRIGHT: (C)2019,JPO&INPIT
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