PURPOSE: To prevent a cassette inserted with a force larger than a required level by providing a control means which controls a holder driving means so as not to load a cassette holder when it is detected that the insertion of the cassette is performed with an external force larger than a prescribed value by an abnormal insertion detecting means.

CONSTITUTION: A control circuit 4 that is the control means is comprised so as to control the motor 10 of the holder driving means A via a motor driving circuit 25 based on an insertion position detection sensor S1, a loading position detection sensor S2, a cassette-in detection sensor S3, and an eject mode signal. The loading of the cassette 3 can be performed by inserting the cassette 3 to the cassette holder 2 with an appropriate force, however, when it is inserted with the force larger than the required level, no loading of the cassette 3 is performed by detecting abnormal insertion by the abnormal insertion detecting means S1, and the insertion of the cassette 3 is performed again by a cassette inserter, thereby, the following inserting state of the cassette 3 can be recognized. In such a way, it is possible to prevent the cassette inserted with the force larger than the required level.