The present invention pertains to a microcapsule suspension comprising: (1) an oily core substance of an agrichemical active component dispersed in an oily substance; (2) an aqueous solution that comprises a polycationic colloid and a polyanionic colloid at the proportions of 0.02-1 wt% of the polycationic colloid and 0.02-2 wt% of the polyanionic colloid; and (3) a pH regulator