The present invention relates to a brushless DC motor. The present invention includes: a rotor which a magnet is fixed on and combined with the outer circumference surface of a rotor core; and a stator which is installed outside the radial direction of the rotor. A plane adhesive surface is formed on the outer circumference surface of the rotor core. The magnet is formed in a rectangular shape, is fixed on and combined with the adhesive surface of the rotor core so as to reduce costs of the magnet without the degradation of the motor and prevent the magnet from being separated by centrifugal force by attaching the magnet to the rotor securely.
