A wastegate valve comprising: a valving element which opens and closes an exhaust gas bypass path (9a, 9b), the exhaust gas bypass path (9a, 9b) extracting a part of exhaust gas flow from an inlet side of an exhaust gas path of a turbine housing and feeding the part of the exhaust gas to an exhaust gas outlet path; a valve stem which stands upright from the valving element; an operating lever which has one end formed with an insertion hole where the valve stem is inserted with play and other end to which rotational force is applied; a support plate which is provided on one end of the valve stem opposite to the other end which is inserted through the insertion hole; and a damping member (19; 41; 51; 61) which is provided between the support plate and the operating lever in an axial direction of the valve stem to suppress vibration in the axial direction of the valve stem so as to suppress vibration of the valving element, wherein the damping member (19; 41; 51; 61) has a large-diameter part and at least two small-diameter parts with a diameter smaller than the large-diameter part in a space between the support plate and the operating lever in the axial direction, the large-diameter part and the at least two small-diameter parts being arranged concentrically with an axial center of the valve stem, and wherein a pair of the at least two small-diameter parts constitute a first contact part where the damping member (19; 41; 51; 61) contacts an operating lever side and a second contact part where the damping member (19; 41; 51; 61) contacts a support plate side respectively, the pair of the at least two small-diameter parts being respectively disposed at both ends of the damping member in the axial direction. a valving element which opens and closes an exhaust gas bypass path (9a, 9b), the exhaust gas bypass path (9a, 9b) extracting a part of exhaust gas flow from an inlet side of an exhaust gas path of a turbine housing and feeding the part of the exhaust gas to an exhaust gas outlet path; a valve stem which stands upright from the valving element; an operating lever which has one end formed with an insertion hole where the valve stem is inserted with play and other end to which rotational force is applied; a support plate which is provided on one end of the valve stem opposite to the other end which is inserted through the insertion hole; and a damping member (19; 41; 51; 61) which is provided between the support plate and the operating lever in an axial direction of the valve stem to suppress vibration in the axial direction of the valve stem so as to suppress vibration of the valving element, wherein the damping member (19; 41; 51; 61) has a large-diameter part and at least two small-diameter parts with a diameter smaller than the large-diameter part in a space between the support plate and the operating lever in the axial direction, the large-diameter part and the at least two small-diameter parts being arranged concentrically with an axial center of the valve stem, and wherein a pair of the at least two small-diameter parts constitute a first contact part where the damping member (19; 41; 51; 61) contacts an operating lever side and a second contact part where the damping member (19; 41; 51; 61) contacts a support plate side respectively, the pair of the at least two small-diameter parts being respectively disposed at both ends of the damping member in the axial direction.