A pressure vessel (10) includes a liner (12) and a reinforcing layer (14). The liner (12) includes a body portion (16) having a cylindrical shape. The liner (12) is configured such that a gas is filled in the liner (12). The reinforcing layer (14) is made of a material having a linear expansion coefficient lower than a linear expansion coefficient of a material of the liner (12). The reinforcing layer (14) is formed in contact with an outer surface (12A) of the body portion (16). The reinforcing layer (14) is configured to cover the liner (12) from outside the liner (12). A thickness of the body portion (16) is set to such a value that the outer surface (12A) of the body portion (16) is not separated from the reinforcing layer (14) when the gas that has been filled in the liner (12) is discharged out of the liner (12).