PURPOSE: To make the reel base driving device of a magnetic recording and reproducing device such as a VTR and a DAT thin.

CONSTITUTION: This device is provided with a first winding side rotary body 34 directly driving a reel base 15 and a second winding side rotary body 19 driving via friction members 18, 20. The torque of a capstan motor 1 is transmitted to a center pulley 30 via a pulley 3 and a belt 4. In a reproduction mode, the inclined face 14c of a selection lever 14 and the inclined face 31a of a pendulum arm 31 are abutted by the sliding of a main rod 12 and the pendulum arm 31 becomes horizontal. At this time, the center pulley 30 is engaged with the second winding side rotary body 19 via a pendulum rotary body 33. At the time of a fast forwarding mode, the pendulum arm 31 inclines and the center pulley 30 is engaged with the first widing side rotary body 34.