A signal recording and/or reproducing system having a tape cassette storing and transporting arrangement therein comprises a cassette storing apparatus having a plurality of receiving compartments each provided for storing a tape cassette therein and at least one recording and/or reproducing apparatus used with the tape cassette taken out from the cassette storing apparatus. A housing is provided with a control panel portion on the top or front wall thereof and with an opening through which the tape cassette is inserted therein on the side wall thereof and a cassete loading mechanism is provided in the housing for guiding a tape cassette inserted in the housing through the opening provided therein to a tape driving portion. Cassette transporting apparatus transports the tape cassette taken out from the cassette storing apparatus in order to transfer the same to the recording and/or reproducing apparatus through the opening provided in the housing thereof and to the receiving compartment of the cassette storing apparatus from the recording and/or reproducing apparatus.