Provided is an active matrix substrate that includes a gate line group, a source line group, a pixel electrode arranged in a display area, and a gate line driving circuit (11) formed in the display area. The gate line driving circuit (11) includes an accumulation line that accumulates a voltage for controlling the voltage level of the gate line; an output unit (U1) that controls the voltage level of the gate line according to the voltage of the accumulation line; an accumulated voltage supply unit (U2) that varies the voltage of the accumulation line according to a signal input from another gate line; and accumulated voltage adjustment units (U3) that change the voltage of the accumulation line to a predetermined level according to the control signal. The output unit (U1), the accumulated voltage supply unit (U2), and, the accumulated voltage adjustment units (U3) are arrayed along the gate line, and the output unit (U1) is arranged at a position interposed between the accumulated voltage adjustment units (U3).