Abstract: Heterocyclic amine derivatives represented by general formula (I): wherein R1, R2 and R3 represent each H, optionally halogenated C3-6 cycloalkyl, etc.; Q represents an optionally substituted heterocycle containing O, S or N; X represents halogeno, cyano, halo(C1-6)alkyl, etc.; n is from 1 to 4; and Z1 and Z2 represent each O or S; and intermediates thereof represented by the following general formula (IV?): Q?—NH2 wherein Q? represents a definite heterocycle selected from among those represented by Q. Agricultural/horticultural insecticides having a remarkable effect of controlling pest insects of crops such as rice, fruit trees and vegetables, as well as various agricultural, forestry, horticultural and stored grain pest insects.