Manufacturing method of rotor and rotor

A manufacturing method of a rotor to be used in a motor along with a stator, the rotor having insertion holes arranged in a circumferential direction around an axis of the rotor, and comprising a magnet and resin that are placed in each of the insertion holes, the manufacturing method of the rotor comprising:

• a first step of placing the magnet and the resin in each of first insertion holes among the insertion holes, and identifying an unbalance position of the rotor by rotating the rotor at a first rotation speed;
• a second step of placing the magnet and the resin in each of second insertion holes among the insertion holes in which the magnet is not placed in the first step, and rotating the rotor at a second rotation speed, the second insertion holes being relatively far from the unbalance position;
• and
• a third step of placing the magnet and the resin in each of third insertion holes among the insertion holes in which the magnet is not placed in the first step, and rotating the rotor at a third rotation speed smaller than the second rotation speed, the third insertion holes being relatively close to the unbalance position.