A rotor includes a hub, a permanent magnet and a shaft. The hub has an inner surface and an outer surface, with an assembling hole being formed at the center of the inner surface. The permanent magnet is mounted on the inner surface of the hub. The shaft has two ends, with one end being a connecting end. The connecting end is fixed in the assembling hole of the hub. An extending member is arranged at the connecting end and extends radially from a radial surface of the shaft. The extending member is embedded in a wall of the hub. Consequently, a contact area between the hub and the shaft is radially extended and increased to provide a reliable combination of the hub and the shaft, and the rotor can be applied to a motor with minimizing dimensions.