Abstract: An isoxazoline derivative represented by the following general formula [I]: wherein R1 and R2 may be the same or different and are each an alkyl group; R3, R4, R5 and R6 are each a hydrogen atom; Y is an optionally substituted 5- to 6-membered aromatic heterocyclic group or fused aromatic heterocyclic group having a hetero atom selected from a nitrogen atom, a oxygen atom and a sulfur atom; and n is an integer: of 0 to 2. The isoxazoline derivative has an excellent herbicidal effect and an excellent selectivity between crop and weed.