A high-pressure vessel includes: a body portion formed in a cylindrical shape, with at least one end portion of the body portion, in an axial direction thereof, being open; a cap, at least part of which is inserted inside at least one open end portion of the body portion to plug the at least one open end portion; a first reinforcement layer provided on an outer peripheral surface of the body portion and made of fiber-reinforced plastic, a fiber direction of which coincides with a circumferential direction of the body portion; and a second reinforcement layer integrated with the first reinforcement layer and made of fiber-reinforced plastic including fibers that bridge one end portion and another end portion, in the axial direction, of the body portion.