A high-pressure trunnion ball valve which is particularly suitable for a high-pressure fluid, suppresses a thrust load to a stem to realize low torque performance while maintaining a valve seat sealing performance even under a high pressure, and can perform opening and closing operations by an approximately constant and stable operation torque and can be made small, and a hydrogen station using the same are provided. The high-pressure trunnion ball valve is composed of a ball 10 rotatably provided in a body 3 having a lid member 2, a seat retainer 11 seal-connected to the ball 10, a spring member 12 applying an elastic force to the seat retainer 11 to a seal side, and a seal member 13 attached to an outer circumferential face of the seat retainer 11. An upper stem 50 and a lower stem 51 having the same diameter are provided on an upper side and a lower side of the ball 10 in an extending manner, respectively, to constitute a ball member 52, shaft-attaching seal mechanisms 20 having the same structure are attached to the upper and lower stems 50 and 51 at symmetrical positions regarding the ball 10 to achieve a balance structure, thereby avoiding thrust loads.