PURPOSE: To drive assuredly a magnetic tape to the 1st reel shaft from the 2nd reel shaft at the same speed as that of an FF (fast forward) mode even though a magnetic signal is read out of the magnetic tape, by bringing a magnetic head into contact with the magnetic tape in case of an FF mode.

CONSTITUTION: When an FF button (not shown in the figure) of a tape recorder is pushed, a revolving power generating means transmits the revolving power to the 1st revolving power transmitting member 38 via a revolving power transmitting means. The revolving power of the generating means is transmitted indirectly to the 1st rotary member 22 via a slip member 26 and the 2nd rotary member 24. Furthermore the revolving power is tranmitted directly to the member 22 with no intervention of the member 26. Thus the travelling of a magnetic tape from a reel hub to the other reel hub loaded to the 1st reel shaft 12 over the shaft 12 with no generation of any slip is assuredly made possible.