A display device including optical sensors in a pixel region, in which the number of bus lines for supplying driving signals to the optical sensors is reduced, is provided. The display device includes a display pixel circuit (8) and a sensor pixel circuit (9) that are provided in a pixel region (4) of an active matrix substrate. The sensor pixel circuit (9) includes: a light receiving element (D1); an accumulation node for accumulating charges corresponding to an amount of light incident on the light receiving element (D1); and a readout switching element (T2) that reads out charges in the accumulation node. The display device further includes; a driving circuit that supplies a sensor driving signal for controlling a resetting operation and an accumulating operation of the accumulation node, to the sensor pixel circuit (9), via a source line (SL) for supplying a display data signal to the display pixel circuit (8); and a protection switching element (M1), (M2) connected to a sensor control line (EL) provided in addition to the source line (SL), the protection switching element protecting the sensor signal of the sensor pixel circuit.