A compound represented by Formula or a salt thereof: wherein R 1 represents an optionally substituted 4- to 6-membered monocyclic unsaturated heterocyclic group having 1 to 3 hetero atoms selected from among N, S, and O; R 2 represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; R 3, R 4, and Rs, which may be the same or different, each represent a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; or R 3 and R 4, together with a nitrogen atom to which they are bound, form a 4- to 6-membered monocyclic saturated heterocycle having 1 to 3 hetero atoms selected from among N, S, and O, and R 5 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; or R 4 and R 5, together with a nitrogen atom to which they are bound and a carbon atom adjacent thereto, form a 4- to 6-membered monocyclic saturated heterocycle having 1 to 3 hetero atoms selected from among N, S, and O, and R 3 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; R 6 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; R 7 and R 8, which may be the same or different, each represent a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; or R 7 and R 8, together with a carbon atom to which they are bound, form a C3-C10 cycloalkyl group; X 1 and X 2, which may be the same or different, each represent N or CR 9, and R 9 represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; and X 3 represents N or CH when a broken line () indicates a single bond, or C when a broken line indicates a double bond, provided that at least either one of X 1 or X 2 represents N. R 1 represents an optionally substituted 4- to 6-membered monocyclic unsaturated heterocyclic group having 1 to 3 hetero atoms selected from among N, S, and O; R 2 represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; R 3, R 4, and Rs, which may be the same or different, each represent a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; or R 3 and R 4, together with a nitrogen atom to which they are bound, form a 4- to 6-membered monocyclic saturated heterocycle having 1 to 3 hetero atoms selected from among N, S, and O, and R 5 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; or R 4 and R 5, together with a nitrogen atom to which they are bound and a carbon atom adjacent thereto, form a 4- to 6-membered monocyclic saturated heterocycle having 1 to 3 hetero atoms selected from among N, S, and O, and R 3 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; R 6 represents a hydrogen atom, a C1-C6 alkyl group, a C1-C6 haloalkyl group, or a C3-C6 cycloalkyl group; R 7 and R 8, which may be the same or different, each represent a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; or R 7 and R 8, together with a carbon atom to which they are bound, form a C3-C10 cycloalkyl group; X 1 and X 2, which may be the same or different, each represent N or CR 9, and R 9 represents a hydrogen atom, a halogen atom, a hydroxyl group, an amino group, a cyano group, a nitro group, a C1-C6 alkyl group, a C1-C6 haloalkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group, or a C3-C6 cycloalkyl group; and X 3 represents N or CH when a broken line () indicates a single bond, or C when a broken line indicates a double bond, provided that at least either one of X 1 or X 2 represents N.