EXHAUST VALVE DEVICE FOR VEHICLE

Provided is an exhaust valve device for a vehicle in which a valve element is supported in an exhaust passage by a rotating shaft axially supported by a valve body , a flexible joint member is secured to an output shaft of a motor unit attached to the valve body , and a lower end of the flexible joint member and an upper end of the rotating shaft are coupled via a rigid joint member , in which the rigid joint member includes: a sealing element having a sealing surface and arm portions , the sealing surface being coupled to one end of the rotating shaft and sealing an axially supported portion of one end of the rotating shaft to prevent exhaust gas from leaking, the arm portions being formed in a periphery of the sealing surface ; and a transmission element having a spring groove and engagement grooves , the spring groove being coupled to the end of the flexible joint member , the engagement grooves being engaged with the arm portions of the sealing element to restrict relative rotation.