Provided is an active matrix substrate for use in a liquid crystal display device in which two scan signal lines (16i and 16j) are scanned simultaneously; pixel regions including two pixel electrodes each are arranged in the row and column directions when the column direction is the scanning direction; one scan signal line is provided for one pixel region row; and a shielding conductive body (41p) is disposed to cover the gap between two adjacent pixel electrodes (17ib and 17ja), one of which is a pixel electrode included in a given pixel region (101) and the other is a pixel electrode included in a pixel region (102) adjacent to said given pixel region (101) on the downstream side of the scanning direction. By using the present active matrix substrate, the display quality of a liquid crystal display device in which two scan signal lines are selected simultaneously can be improved.