A nanoemulsion emulsification composition including the following components (A) to (D), in which the mass ratios of the components satisfy the following condition,[(A)+(B)]:(C):(D)=1:4 to 8:0.4 to 0.8；component (A) is a copolymer including a constitutional unit (a1) represented by Formula (1) and a constitutional unit (a2) represented by Formula (2), the molar ratio of the constitutional units (a1):(a2) being 5:95 to 60:40, and the weight average molecular weight being 5,000 to 5,000,000；R1 represents a hydrogen atom or a methyl groupR2 represents a hydrogen atom or a methyl group, and R3 represents a hydrocarbon group having 12 to 24 carbons；component (B) is a nonionic surfactant having an HLB value of 10 to 14, component (C) is a polyhydric alcohol, and component (D) is water.
