There are provided a DC/DC converter and a display device. The DC/DC converter includes: an inductor connected to an input terminal； a switching element connected between the inductor and the earth； a diode connected between the inductor and an output terminal； a capacitor connected between the output terminal and the earth； a feedback circuit connected between the output terminal and the earth and outputting a feedback voltage； and an oscillating circuit performing an ON/OFF control of the switching element at a frequency corresponding to the received feedback voltage. The DC/DC converter further includes: a detection circuit which detects an external magnetic field and outputs a signal that is different depending on whether or not the detected magnetic field exceeds a predetermined threshold； and a control circuit performing a control of the DC/DC converter according to the signal, to suppress an overcurrent of the DC/DC converter in a strong magnetic field.
