A brake hub (36) and a second gear shaft (22) are rotatably supported by a bearing (42) and a bearing (43), the bearing (42) interposed between a projection (11D-1) of a support member (11D) disposed on the inner side of a recess (36a) of the brake hub and the inner peripheral surface of the recess, the bearing (43) interposed between a support member (11E) surrounding a top end portion of the brake hub and the top end portion of the brake hub. The transfer further comprises a disc pressing pin (50) inserted through a hole (11D-4) in the support member, a pressing plate (51) disposed on the outer side of the support member, and plate pressing means. The plate pressing means presses the pressing plate, the pressing plate presses the disc pressing pin, and the disc pressing pin presses a press brake disc (35C).