The present invention relates to malononitrile compounds of formula (Y): wherein R1 and R2 are the same or different and independently C1-C5 (halo)alkyl, C1-C5 (halo)alkyloxy, C2-C5 (halo)alkenyl, C2-C5 (halo)alkynyl, hydrogen, or cyano; R3 is C1-C3 haloalkyl, C2-C4 haloalkenyl, or C2-C4 haloalkynyl; m is an integer of 1 to 3; R5 is halogen, cyano, nitro, C1-C4 (halo)alkyl, or the like; n is an integer of 0 to 4, with the proviso that when n is 2 or more, then R5's are the same or different from each other; R6 is hydrogen, halogen, cyano, nitro, C1-C4 (halo)alkyl, or the like; as well as pesticide compositions containing these compounds as active ingredients. The present invention makes it possible to effectively control pests such as insect pests, a
