In crop production in the fields of agriculture, horticulture and the like, the damage caused by insect pests etc. is still immense, and insect pests resistant to existing insecticides have emerged. Under such circumstances, the development of novel agricultural and horticultural insecticides is desired. The present invention provides an agricultural and horticultural insecticide comprising the indoline compound represented by the general formula (1): (wherein R1 and R4 are hydrogen atoms, R2 and R3 are halogen atoms, R5 is a haloalkyl group, Ra, Rb and Rc are hydrogen atoms, A1 is a CH group, A2 is a nitrogen atom, A3 is N-Me, m is 2, and n is 1), or a salt thereof as an active ingredient; and a method for using the insecticide.