Provided is an active matrix substrate in which differences of parasitic capacitances among lead-out lines connected with signal lines can be reduced, as well as a display device and a touch-panel-equipped display device including the same. An active matrix substrate includes: a plurality of signal lines S1 to S9 arranged so as to be parallel to one another in a display area provided on a substrate; and a plurality of lead-out lines L1 to L9 that are connected with the signal lines S1 to S9 outside the display area. Outside the display area, the lead-out lines L1 to L9 are separately arranged in at least three layers, the three layers being a bottommost line layer that is formed at the position closest to the substrate, a topmost line layer that is formed at the position farthest from the substrate, and an intermediate line layer that is formed between the bottommost line layer and the topmost line layer. A capacitance is formed between the signal line S3 connected with the lead-out line L3 provided in the bottommost line layer, and the signal line S4 connected with the lead-out line L4 provided in the topmost line layer.