A driving apparatus for loading/unloading a pair of pole-base assemblies that are reciprocated along a guide rail formed on a main deck to move a magnetic tape to contact to a head drum. The driving apparatus includes a first and a second link member, each connected with one end to each pole-base assembly, a first and a second loading gears, each connected to the other end of the first and the second link member, and being rotated in association with each other; and a main gear which is rotated by the power received from a driving motor mounted on the main deck and selectively engaged with the first loading gear upon rotation thereof. The main gear is rotated in association with one of the loading gears within a desired rotational range upon rotation thereof, so as to transfer power for loading/unloading the pole-base assembly.