To provide a car disk drive unit operating in a stable condition which is hardly affected by temperature changes in a vehicle, a car disk drive unit 1 of the present invention comprises: a casing 3 for accommodating a disk drive 2; a Peltier element 4 used as means for controlling the temperature being close to the upper surface of the casing 3 through an intermediate plate 18; a heat sink 5 being close to a base slice 50 on the lower surface of the Peltier element 4; an electric fan 6 for ventilating air to the heat sink 5; and a housing 11 for accommodating the casing 3 in the upper part as well as securing the heat sink 5 and the electric fan 6 to the lower part.

 
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