Pressure vessel and manufacturing method thereof

A pressure vessel manufacturing method in which a vessel main body having a cylindrical straight body part, a first domed part and a second domed part, the first domed part including a first hemispherical portion, the second domed part including a second hemispherical portion, the first hemispherical portion and the second hemispherical portion having hemispherical shapes and being integrally formed at each end of the straight body part, is wound with reinforcing fibers to reinforce the vessel main body, the method comprising:

• a first step of winding the reinforcing fibers around an outer circumferential surface of the first domed part such that the reinforcing fibers are interlaced with each other;
• a second step of helically winding the reinforcing fibers around an outer circumferential surface of the straight body part, continuously from the first step;
• and
• a third step of winding the reinforcing fibers around an outer circumferential surface of the second domed part such that the reinforcing fibers are interlaced with each other, continuously from the second step.