A liquid crystal display device (50a) includes: an active matrix substrate (20a) having a plurality of gate lines (1a) extending in parallel with each other; a counter substrate (30a) arranged so as to face the active matrix substrate (20a); a liquid crystal layer (25) interposed between the active matrix substrate (20a) and the counter substrate (30a); and spherical spacers (21) disposed between the active matrix substrate (20a) and the counter substrate (30a) so as to overlap each gate line (1a), for defining a thickness of the liquid crystal layer (25). A protruding wall (9a) is provided over each gate line (1a) of the active matrix substrate (20a) so as to surround the spacers (21).