The present invention relates to a novel malononitrile compound represented by the formula (I): wherein, R¹ represents a C1 to C5 (halo)alkyl and the like, R² represents a C1 to C5 (halo)alkyl, R³ and R⁴ are the same or different and are a C1 to C6 (halo)alkyl and the like, R⁵ represents a halogen atom and the like, n is an integer of 0 to 4 and when n is 2 or more, R⁵ may be the same or different. The malononitrile compound has an efficient pesticidal activity and can control effectively pests such as insect pests, acarine pests, nematode pests and the like ##STR1##