Rotary machining device, method of manufacturing hub unit bearing and method of manufacturing vehicle

A rotary machining device comprising:

• a reference axis;
• a support jig which supports a workpiece such that a central axis of the workpiece and the reference axis are coaxial with each other;
• a shaft-equipped spherical seat which includes a machining portion having a central axis inclined with respect to the reference axis and formed at one axial end portion, and a convex spherical portion having a partially spherical shape, formed at an axially intermediate portion and facing the other axial end side;
• a concave spherical seat including an insertion hole through which the other axial end portion of the shaft-equipped spherical seat is inserted, and a concave spherical portion which spherically engages with the convex spherical portion;
• an oil receiver having an annular recess portion which faces an entire circumference of an outer circumferential edge of the concave spherical portion;
• and
• a guide member which guides lubricating oil, which has flowed out from a spherical engagement portion between the convex spherical portion and the concave spherical portion, toward the annular recess portion, the other axial end portion of the guide member being supported by a portion of the shaft-equipped spherical seat on one axial end side.