A head drum and tape transport driving device for a video tape recorder which can transport the magnetic tape by means of one motor used for driving the had drum. Supply and take-up reels are provided for supplying a data-recordable tape and winding up the same. A head drum carries a head for recording and/or reproducing data on or from the tape. A motor drives the head drum and a tape transport device transports the tape past the head drum. A first power transmission transfers motive power from the motor to tape transport device and a second power transmission selectively transfers motive power of the tape transport device to the supply reel or the take-up reel.