A rotor of a rotating electric machine includes a rotor yoke and a pair of end plates disposed on both axial sides of the rotor yoke. The rotor yoke is provided with a yoke cavity portion axially passing through a yoke main body, end plate hole portions communicating with the yoke cavity portion are provided in the pair of end plates, the yoke cavity portion and the end plate hole portions have a substantially triangular shape protruding toward an outer-diameter-side, and in the yoke cavity portion, top portions on both circumferential sides and a top portion on an outer-diameter-side are exposed from the end plate hole portions.