A slewing bearing device for a wind turbine for attaching a wind turbine blade to a rotor hub rotatably, the slewing bearing device comprising: an outer race fixed to the rotor hub; an inner race fixed to the wind turbine blade; and a plurality of rolling elements disposed between the outer race and the inner race; a force receiving part fixed to the rotor hub, the force receiving part being configured to receive force transmitted from an outer circumferential surface of the outer race when the outer race is about to deform outward in a radial direction of the outer race, wherein the force receiving part includes a support portion disposed over the entire region in the circumferential direction of the outer race so as to support the outer race, and a protrusion portion protruding in the axial direction of the outer race along the outer circumferential surface of the outer race from the support portion wherein the force receiving part includes a first tapered surface facing the outer circumferential surface of the outer race, and wherein the first tapered surface is formed so that a gap between the first tapered surface and the outer circumferential surface of the outer race is reduced toward the rotor hub in an axial direction of the outer race, wherein the slewing bearing device for a wind turbine further comprises a wedge member disposed between the first tapered surface and the outer circumferential surface of the outer race characterized in that the slewing bearing device further comprises a bolt extending in the axial direction of the outer race, for fixing the wedge member to the force receiving part and applying pressing force toward the rotor hub in the axial direction of the outer race to the wedge member, wherein the wedge member includes a bolt penetration portion including a through hole into which the bolt is inserted, wherein the through hole is disposed outside the second tapered surface in the radial direction of the outer race, each through hole being a clearance hole with no thread, and the diameter of each through hole being set to be larger than the diameter of the shaft portion of each bolt and wherein a gap is formed in the axial direction of the bolt between the protrusion portion and the bolt penetration portion. an outer race fixed to the rotor hub; an inner race fixed to the wind turbine blade; and a plurality of rolling elements disposed between the outer race and the inner race; a force receiving part fixed to the rotor hub, the force receiving part being configured to receive force transmitted from an outer circumferential surface of the outer race when the outer race is about to deform outward in a radial direction of the outer race, wherein the force receiving part includes a support portion disposed over the entire region in the circumferential direction of the outer race so as to support the outer race, and a protrusion portion protruding in the axial direction of the outer race along the outer circumferential surface of the outer race from the support portion wherein the force receiving part includes a first tapered surface facing the outer circumferential surface of the outer race, and wherein the first tapered surface is formed so that a gap between the first tapered surface and the outer circumferential surface of the outer race is reduced toward the rotor hub in an axial direction of the outer race, wherein the slewing bearing device for a wind turbine further comprises a wedge member disposed between the first tapered surface and the outer circumferential surface of the outer race characterized in that the slewing bearing device further comprises a bolt extending in the axial direction of the outer race, for fixing the wedge member to the force receiving part and applying pressing force toward the rotor hub in the axial direction of the outer race to the wedge member, wherein the wedge member includes a bolt penetration portion including a through hole into which the bolt is inserted, wherein the through hole is disposed outside the second tapered surface in the radial direction of the outer race, each through hole being a clearance hole with no thread, and the diameter of each through hole being set to be larger than the diameter of the shaft portion of each bolt and wherein a gap is formed in the axial direction of the bolt between the protrusion portion and the bolt penetration portion.