PURPOSE: To apply fixed back tension to a magnetic tape pulled out of a cassette half with a simple mechanism.

CONSTITUTION: A tension roller 270 is rotatably provided on a chassis base 260, and a pull roller 701 is elected on a pull arm 710 so as to pull a magnetic tape 182 out of a loaded cassette half 180. The pull arm 710 moves the pull roller 701 between a tape housing position and a tape pull-out position while being interlocked with the motion of a slide plate 510. At the tape pull-out position, the pull roller 701 is pressed to the tension roller 270. Therefore, in the case of passing between the tension roller 270 and the left side pull roller 701, the fixed back tension is applied to the magnetic tape 182 under running by the rotation load torque of the tension roller 270. Thus, the running state of the magnetic tape 182 is stablized, and trouble caused by slack or the like is prevented.