This aqueous pest control liquid which contains: a pyrethroid compound shown by formula (1) in this formula R1 and R2 which may be the same or different represent a hydrogen atom a methyl group a trifluoromethyl group or a chlorine atom and R3 represents a methyl group or a methoxymethyl group an ester compound having a vapor pressure of 1—10-10to 1—10-4mmHg as measured at 25°C by the Donovan method and having one or more (C4-C12 alkoxy)carbonyl groups glycol ether and water can cause a fixed amount of a pest control component to volatilize over a long period of time and has an excellent pest control effect.