The present invention relates to a brushless DC motor having a slotless stator, and more specifically relates to a brushless DC motor having a slotless stator adapted to avoid the occurrence of forces impeding rotation that occur in the rotor by forming a bobbin from an insulating material while at the same time allowing high-output DC motor supply; the invention making it possible to wind a large amount of coils in the length direction of a rotational shaft by forming a plurality of coil-winding projections, that allow coils to be wound on a bobbin, such that the coil-winding projections project with gaps at predetermined intervals along the circumference of the outer circumferential surface of the body of the bobbin.