To provide a vehicular illumination control device capable of suppressing an increase in size of a circuit even when the number of switches is increased.

The current flowing when turning on one of illuminations 2 built in knobs of a plurality of switches is detected by resistors 12 and 13. In a switching regulator IC 14, the voltage signal according to the detected current is given to an input terminal -IN, the PWM signal based on the voltage signal is outputted, and a PET 43 controls the current supplied to the plurality of illuminations 2 from a power source of a battery 4 mounted on a car by performing the switching operation based on the PWM signal. Further, by superposing the divided electric potential of the battery 4 on the input terminal -IN, the PWM signal outputted from the IC 14 is directly shut off when the voltage of the battery 4 is abnormally increased.