A 2H-chromene compound represented by the following formula or a salt thereof: wherein: A represents C 1-6 alkyl, cycloalkyl, aryl or heteroaryl, wherein the aryl and heteroaryl groups may each be substituted with 1-5 R 1 s which are the same or different; R 1 represents halogen, -CN, -NO 2, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, halogeno-C 1-6 alkyl, aryl, heteroaryl, cycloalkyl, -OH, -O-(C 1-6 alkyl), -O-(halogeno-C 1-6 alkyl), -O-(aryl), -O-(cycloalkyl), -O-(heteroaryl), -NH 2, -NH(C 1-6 alkyl), -NH(halogeno-C 1-6 alkyl), -N(C 1-6 alkyl) 2 or cyclic amino, wherein the aryl, heteroaryl, cycloalkyl and cyclic amino groups may each be substituted with 1-5 substituents which are the same or different and are selected from halogen, -CN, C 1-6 alkyl and halogeno-C 1-6 alkyl; L represents C 1-6 alkylene, C 2-6 alkenylene, C 2-6 alkynylene, -(C 1-6 alkylene)-O-, - O-(C 1-6 alkylene)- or -(C 1-6 alkylene)-O-(C 1-6 alkylene)-; Q represents -C(R 2B)=C(R 2C)-; R 2A, R 2B, and R 2C are the same or different and represent -H, halogen, C 1-6 alkyl, halogeno-C 1-6 alkyl, -O-(C 1-6 alkyl) or -O-(halogeno-C 1-6 alkyl); Y represents O; m represents 0; R 3 represents -H, halogen, C 1-6 alkyl, halogeno-C 1-6 alkyl or aryl; R 4A represents -H or C 1-6 alkyl; R 4B represents C 1-6 alkyl substituted with Group G, or cycloalkyl substituted with Group G; or R 4A and R 4B are combined with N to which they bind to form a cyclic amino group substituted with Group G, the cyclic amino group optionally further having 1-4 substituents which are the same or different and are selected from halogen, C 1-6 alkyl, and halogeno-C 1-6 alkyl; and Group G is -C(=O)OH, tetrazolyl, -C(=O) NHS(=O) 2 (C 1-6 alkyl), (C 1-6 alkylene)-C(=O)OH or A represents C 1-6 alkyl, cycloalkyl, aryl or heteroaryl, wherein the aryl and heteroaryl groups may each be substituted with 1-5 R 1 s which are the same or different; R 1 represents halogen, -CN, -NO 2, C 1-6 alkyl, C 2-6 alkenyl, C 2-6 alkynyl, halogeno-C 1-6 alkyl, aryl, heteroaryl, cycloalkyl, -OH, -O-(C 1-6 alkyl), -O-(halogeno-C 1-6 alkyl), -O-(aryl), -O-(cycloalkyl), -O-(heteroaryl), -NH 2, -NH(C 1-6 alkyl), -NH(halogeno-C 1-6 alkyl), -N(C 1-6 alkyl) 2 or cyclic amino, wherein the aryl, heteroaryl, cycloalkyl and cyclic amino groups may each be substituted with 1-5 substituents which are the same or different and are selected from halogen, -CN, C 1-6 alkyl and halogeno-C 1-6 alkyl; L represents C 1-6 alkylene, C 2-6 alkenylene, C 2-6 alkynylene, -(C 1-6 alkylene)-O-, - O-(C 1-6 alkylene)- or -(C 1-6 alkylene)-O-(C 1-6 alkylene)-; Q represents -C(R 2B)=C(R 2C)-; R 2A, R 2B, and R 2C are the same or different and represent -H, halogen, C 1-6 alkyl, halogeno-C 1-6 alkyl, -O-(C 1-6 alkyl) or -O-(halogeno-C 1-6 alkyl); Y represents O; m represents 0; R 3 represents -H, halogen, C 1-6 alkyl, halogeno-C 1-6 alkyl or aryl; R 4A represents -H or C 1-6 alkyl; R 4B represents C 1-6 alkyl substituted with Group G, or cycloalkyl substituted with Group G; or R 4A and R 4B are combined with N to which they bind to form a cyclic amino group substituted with Group G, the cyclic amino group optionally further having 1-4 substituents which are the same or different and are selected from halogen, C 1-6 alkyl, and halogeno-C 1-6 alkyl; and Group G is -C(=O)OH, tetrazolyl, -C(=O) NHS(=O) 2 (C 1-6 alkyl), (C 1-6 alkylene)-C(=O)OH or