Provision of a wastegate valve permitting achievement in reduction in overall weight and decrease in cost due to having made an attachment plate more compact. A wastegate valve (50) formed such that the overall shape thereof is approximately L-shaped as seen in plan view and such that a rotary shaft (58) extends, in a direction approximately perpendicular to a central axis (O) of a valve body (56) and in such fashion as to be offset from the valve body (56), from an attachment plate (52) which supports the valve body (56); wherein a rotary shaft main body (58A) is secured by solid-phase welding to a side of the attachment plate (56). By making an attachment plate (56) more compact, reduction in overall weight and decrease in cost of a valve (50) are achieved, and constraints that would otherwise apply to design of an exhaust gas flow path (9) provided with a bypass flow path (10) are also alleviated.
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