The purpose of the present invention is to provide a non-aqueous secondary battery functional layer composition capable of forming a functional layer that has excellent heat shrinkage resistance, and that can cause non-aqueous secondary batteries to exhibit excellent cycle characteristics. This functional layer composition is a non-aqueous secondary battery functional layer composition including organic particles and a solvent, wherein the organic particles include a multifunctional ethylenically unsaturated monomeric unit at 55 to 90 mass%, and the volume average particle diameter of the organic particles is 50 to 370 nm.