Rotor of rotary-electric machine

In a rotor (4) of a rotary-electric machine, in order to improve a cooling performance of a rotor winding, in a rotor winding on an end portion of the rotor (4) in an axial direction, the rotor winding being held by a retaining ring (3) of the rotor winding formed by laminating a plurality of conductors (11-19) in slots (6) of a rotor iron core (4a) extending in an axial direction and having a plurality of slots (6) formed at predetermined intervals in a peripheral direction, ventilation channels (41-49) through which cooling air (9) flows are formed in the surfaces of the conductors (11-19) along a longitudinal direction. The ventilation channels (41-49) have air inlet holes (21-29) which guide the cooling air (9) and exhaust holes (51-59) which exhaust the cooling air (9), the conductors (11-19) provided with the ventilation channels (41-49) which are formed in the surfaces of the conductors (11-19) along the longitudinal direction and through which the cooling air (9) flows are laminated to constitute the rotor winding, and the conductors (11-19) include openings of the air inlet holes (21-29) in bottoms of the conductors (11-19) on a side opposite to a side on which the ventilation channels (41-49) are formed.