Support structure for rotating member

A support structure for a rotating member, in which a support body supporting a rotating member so as to be rotatable around a predetermined axis is provided with a spherical support face that is recessed toward a side opposite to the rotating member, and a back face of the rotating member is rotatably and slidably supported on the support face,

• wherein the back face of the rotating member is formed as a convexly curved face that is curved so that portions on opposite sides of the predetermined axis each protrude toward the support face when viewed in a cross section containing an entirety of the predetermined axis, and in order for the back face to be supported on the support face via an apex portion of the convexly curved face, a radius of curvature of at least the apex portion is set smaller than a radius of curvature of the support face when viewed in the cross section, and
• wherein a thrust washer having an outside face with a spherical shape that is convex toward the support face side is disposed between the support face and the back face, and the outside face of the thrust washer is formed so as to have a radius of curvature that is larger than the radius of curvature of the support face when viewed in the cross section.