A slide type cassette loading apparatus includes a loading section (20) for receiving a tape cassette (31) to move the same between an inlet/outlet position and a reference position for loading, and a movable chassis (3) for sliding the cassette, located in the reference position, to a recording/reproducing position while carrying the cassette on the movable chassis. The loading section (20) is of a double structure type which has an outer cassette holder (5) pivotable relative to the movable chassis (3) and an inner cassette holder (4) supported to the outer cassette holder (5). The inner cassette holder (4) is mounted on the outer cassette holder (5) so as to make a pivotal movement together with the outer cassette holder (5) and be movable in slide directions of the cassette (31), and is operatively coupled to the movable chassis (3) so as to be movable together with the movable chassis (3).