Stable suspended pest control agent

Even when a cationic pest control active ingredient and / or an acid is used, solid particles do not settle and separate to form a hard cake, or gel and lose fluidity, so that the dispersion is excellent over a long period of time. Provided is a suspended pest control agent that maintains stability. The suspended pest control agent of the present invention comprises (a) a cationic pest control active ingredient and / or an acid, (b) a nonionic thickener, (c) a nonionic surfactant, and (d) a solid. Contains active ingredients, as well as (e) water.