A turbocharger (1, 100) including a turbine impeller connected to a compressor impeller, a turbine housing that stores the turbine impeller, and a bypass passage connected to an upstream space and a downstream space of the turbine impeller in the turbine housing for bypassing the turbine impeller, wherein a flow rate of gas supplied to the turbine impeller is adjusted by opening and closing an opening of the bypass passage, the turbocharger (1, 100) comprising: a waste gate valve (30, 300, 301, 302, 303, 304) that is provided to the opening so as to be capable of being opened and closed; a shaft member that is rotatably supported by being inserted into a support hole penetrating the turbine housing; an inner coupling member that couples the waste gate valve (30, 300, 301, 302, 303, 304) and one end of the shaft member at the inside of the turbine housing; and an outer coupling member that couples a control unit, which controls an open/close state of the waste gate valve (30, 300, 301, 302, 303, 304), and the other end of the shaft member at the outside of the turbine housing, wherein a seal contact portion (52, 520) is located on the inner coupling member or the outer coupling member along a peripheral edge (62, 622) of the support hole that the inner coupling member or the outer coupling member faces, a seal member (70, 702) is provided between the seal contact portion (52, 520) and the peripheral edge (62, 622) of the support hole to seal a gap between thereof, the waste gate valve (30, 300, 301, 302, 303, 304) is provided with an inclined surface (31, 310, 311, 312, 313, 314) that tilts with respect to the shaft direction of the shaft member on a portion facing the opening, and the inclined surface (31, 310, 311, 312, 313, 314) is configured to be pressed by the gas flow into the bypass passage through the opening when the waste gate valve (30, 300, 301, 302, 303, 304) is opened such that a thrust force (S1, S2) in a direction from the seal member to the support hole is applied to the shaft member. a waste gate valve (30, 300, 301, 302, 303, 304) that is provided to the opening so as to be capable of being opened and closed; a shaft member that is rotatably supported by being inserted into a support hole penetrating the turbine housing; an inner coupling member that couples the waste gate valve (30, 300, 301, 302, 303, 304) and one end of the shaft member at the inside of the turbine housing; and an outer coupling member that couples a control unit, which controls an open/close state of the waste gate valve (30, 300, 301, 302, 303, 304), and the other end of the shaft member at the outside of the turbine housing, wherein a seal contact portion (52, 520) is located on the inner coupling member or the outer coupling member along a peripheral edge (62, 622) of the support hole that the inner coupling member or the outer coupling member faces, a seal member (70, 702) is provided between the seal contact portion (52, 520) and the peripheral edge (62, 622) of the support hole to seal a gap between thereof, the waste gate valve (30, 300, 301, 302, 303, 304) is provided with an inclined surface (31, 310, 311, 312, 313, 314) that tilts with respect to the shaft direction of the shaft member on a portion facing the opening, and the inclined surface (31, 310, 311, 312, 313, 314) is configured to be pressed by the gas flow into the bypass passage through the opening when the waste gate valve (30, 300, 301, 302, 303, 304) is opened such that a thrust force (S1, S2) in a direction from the seal member to the support hole is applied to the shaft member.