The present invention provides a volume control circuit of a car car, which allows a voice signal transmitted through a speaker according to a call operation in a car car to be directly set by the control means for performing overall function control of the car.;Accordingly, according to the present invention, the call signal output of the voice output units 22 and 24 according to the switching operation of the hook switch 6 performs the call signal transmission / reception operation of the transceiver unit 4 through the transceiver antenna 2. In the car car which is; A transistor 8 for passing a call signal from the transmission and reception section 4 by execution of a driving operation, a driving voltage generation section 10 for generating a driving voltage for the audio output sections 22, 24; A control unit 12 for driving the transistor 8 to transmit a call signal through the voice output units 22 and 24 and to control a volume of the output call signal; And a volume control unit 14 for adjusting the volume of the call signal output by the voice output units 22 and 24 under the control of the control unit 12.
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