Structure of a driving unit in a drum type washing machine including a tub for storing washing water, a drum of a metal rotatably mounted inside of the tub disposed horizontal to the ground, or with an angle to the ground for accommodating laundry therein, a shaft connected to the drum mounted inside of the tub through the tub for transmission of a driving force of the motor to the drum, bearings fitted onto outer circumferences of both end portions of the shaft for supporting the shaft, a bearing housing having stator fastening bosses at fixed intervals along a circumference of a central portion thereof for supporting the bearings, a stator having a plurality of magnetic cores each formed by stacking magnetic laminations each having a salient pole projected outward in a radial direction and a rib projected inward in a radial direction, both of which are formed as one unit, frames of insulating material for covering top and bottom surfaces of a magnetic core assembly of the magnetic cores, and coils each wound around each of the salient poles of the magnetic cores, a cup formed rotor having a rotor body of iron or iron alloy with a sidewall, a back yoke, forming a magnetic flux path and a rear wall formed as a unit with the sidewall, and permanent magnets fitted to a setting surface of an "L" formed bent portion of the sidewall, and a connector connecting the rotor and the shaft, thereby reducing noise and troubles as well as a power loss, to improve a productivity of the rotor and the product.