A workpiece feeder for roller workpiece end face processing, comprising: a carrier ring having a plurality of recesses arranged in a radially-inner surface thereof at a predetermined pitch along a circumferential direction; a regulating wheel fitted into the carrier ring to form roller workpiece fitting cavities between a radially-outer surface of the regulating wheel and the plurality of recesses; a carrier support for supporting the carrier ring on a radially-outer side with respect to the plurality of recesses; and rotational force applying means for applying a rotational force to the carrier ring on the radially-outer side with respect to the plurality of recesses, wherein, into each of the roller workpiece fitting cavities, a roller workpiece is fittable so that end faces of the roller workpiece are exposed to an outside with an axial direction of the roller workpiece being in parallel to an axial direction of the carrier ring, characterized in that a) the plurality of recesses each comprise an elastic member arranged therein, the elastic member being suitable to be elastically brought into contact with a radially-outer surface of the roller workpiece to restrain a posture of the roller workpiece, b) a plurality of the carrier supports is arranged on an outer circumferential side of the carrier ring at a predetermined pitch along the circumferential direction, wherein each carrier support includes a pair of support rollers with a first support roller having a circumferential groove formed in its circumferentially-outer surface, the circumferential groove being fitted to one corner portion of a radially-outer surface of the carrier ring from an obliquely outer direction of one surface side of the carrier ring with respect to the carrier ring, and a second support roller having a circumferential groove formed in its circumferentially-outer surface, the circumferential groove being fitted to another corner portion of the radially-outer surface of the carrier ring from an obliquely outer direction of anoter-surface side of the carrier ring with respect to the carrier ring, and c) the rollers are rotatable by friction with the radially-outer surface of the regulating wheel at a processing position where the end faces of the rollers are to be processed. a carrier ring having a plurality of recesses arranged in a radially-inner surface thereof at a predetermined pitch along a circumferential direction; a regulating wheel fitted into the carrier ring to form roller workpiece fitting cavities between a radially-outer surface of the regulating wheel and the plurality of recesses; a carrier support for supporting the carrier ring on a radially-outer side with respect to the plurality of recesses; and rotational force applying means for applying a rotational force to the carrier ring on the radially-outer side with respect to the plurality of recesses, wherein, into each of the roller workpiece fitting cavities, a roller workpiece is fittable so that end faces of the roller workpiece are exposed to an outside with an axial direction of the roller workpiece being in parallel to an axial direction of the carrier ring, a) the plurality of recesses each comprise an elastic member arranged therein, the elastic member being suitable to be elastically brought into contact with a radially-outer surface of the roller workpiece to restrain a posture of the roller workpiece, b) a plurality of the carrier supports is arranged on an outer circumferential side of the carrier ring at a predetermined pitch along the circumferential direction, wherein each carrier support includes a pair of support rollers with a first support roller having a circumferential groove formed in its circumferentially-outer surface, the circumferential groove being fitted to one corner portion of a radially-outer surface of the carrier ring from an obliquely outer direction of one surface side of the carrier ring with respect to the carrier ring, and a second support roller having a circumferential groove formed in its circumferentially-outer surface, the circumferential groove being fitted to another corner portion of the radially-outer surface of the carrier ring from an obliquely outer direction of anoter-surface side of the carrier ring with respect to the carrier ring, and c) the rollers are rotatable by friction with the radially-outer surface of the regulating wheel at a processing position where the end faces of the rollers are to be processed.