PURPOSE: To obtain an effect of vibration-proofness and waterproofness and to prolong the life of a tape player by providing cushions consisting of elastic materials such as rubber on the top and bottom surfaces of the tape player set and between the operating plate of the tape player and the collar part of an inner case.

CONSTITUTION: Cushion pieces 6 consisting of rubber or the like are mounted on the top and bottom surfaces of a tape player set 1 with inclination at θ1° on the plane of height and θ2° on a horizontal plane and with inclination in three directions; X, Y, Z to take the centroid position of the tape player into consideration. A cushion structural body consisting of rubber or the like which provides watertight construction as well is provided in the coller part 2 of the case. The set 1 is installed freely attachably and detachably to the outer case fixed to motor bicycles, etc. Thus the life of the tape player set when the set is installed to open wagons such as motor bicycles is prolonged.