A rotor may include: a shaft; a rotor core assembly including a plurality of slits formed in a radial manner, a magnet housing part formed between the respective slits, and a plurality of rotor cores having different structures depending on whether bridges for closing inner and outer diameter parts of the magnet housing part are formed, wherein the rotor core assembly is formed by stacking the plurality of rotor cores coupled to the shaft; a magnet inserted into each of the magnet housing parts; and a fastening member connecting the rotor cores through the rotor cores.