An LED driver circuit which provides a cost reduction is provided by employing a circuit configuration which allows a size reduction. In at least one example embodiment, the LED driver circuit includes a first switching element, a second switching element, a sense resistor, a sensing unit, a calculator, and a driver. The plurality of LEDs, the first switching element, the second switching element, and the sense resistor are coupled to each other in series in this order. The sensing unit receives a voltage at a node between the second switching element and the sense resistor, and generates voltage data representing the voltage. The calculator calculates a temporal average of a current flowing through the LEDs based on the voltage data, and generates current data corresponding to the temporal average. The driver drives the first switching element and the second switching element based on the current data.