An aqueous gel-encapsulating resin particle emulsion comprising a particle that comprises: an alkali-swellable core portion comprising a (meth)acrylic copolymer having an acid value of 200 to 400 mgKOH/g; and a resin portion encapsulating the core portion and having a non-alkali-swellable outermost layer of the particle, the non-alkali-swellable outermost layer formed using a hydrophobic monomer, wherein: the core portion is an aqueous gel encapsulating a solvent, the resin portion has a thickness of 10% or less of a diameter of the particle; and the particle has an average particle diameter of 1000 nm or larger and 5000 nm or smaller; the core portion is obtained by copolymerizing a monomer mixture comprising: an aliphatic alkyl (meth)acrylate (a1) whose alkyl group has a number of carbon atoms of 3 or less, a carboxy group-containing monomer (a2); and a monomer (a3) having a total number of carbon atoms of 8 to 17 in a range of 30 parts by mass or less when the total amount of the monomers (a1) to (a3) is 100 parts by mass; wherein the monomer (a3) having a total number of carbon atoms of 8 to 17 is a copolymerizable (meth)acrylate-based monomer represented by the following formula: wherein R 1 represents a hydrogen atom or a methyl group, and R 2 represents a benzene ring- or aliphatic ring-containing group having a number of carbon atoms of 4 to 13. an alkali-swellable core portion comprising a (meth)acrylic copolymer having an acid value of 200 to 400 mgKOH/g; and a resin portion encapsulating the core portion and having a non-alkali-swellable outermost layer of the particle, the non-alkali-swellable outermost layer formed using a hydrophobic monomer, wherein: the core portion is an aqueous gel encapsulating a solvent, the resin portion has a thickness of 10% or less of a diameter of the particle; and the particle has an average particle diameter of 1000 nm or larger and 5000 nm or smaller; the core portion is obtained by copolymerizing a monomer mixture comprising: an aliphatic alkyl (meth)acrylate (a1) whose alkyl group has a number of carbon atoms of 3 or less, a carboxy group-containing monomer (a2); and a monomer (a3) having a total number of carbon atoms of 8 to 17 in a range of 30 parts by mass or less when the total amount of the monomers (a1) to (a3) is 100 parts by mass; the core portion is an aqueous gel encapsulating a solvent, the resin portion has a thickness of 10% or less of a diameter of the particle; and the particle has an average particle diameter of 1000 nm or larger and 5000 nm or smaller; the core portion is obtained by copolymerizing a monomer mixture comprising: an aliphatic alkyl (meth)acrylate (a1) whose alkyl group has a number of carbon atoms of 3 or less, a carboxy group-containing monomer (a2); and a monomer (a3) having a total number of carbon atoms of 8 to 17 in a range of 30 parts by mass or less when the total amount of the monomers (a1) to (a3) is 100 parts by mass; an aliphatic alkyl (meth)acrylate (a1) whose alkyl group has a number of carbon atoms of 3 or less, a carboxy group-containing monomer (a2); and a monomer (a3) having a total number of carbon atoms of 8 to 17 in a range of 30 parts by mass or less when the total amount of the monomers (a1) to (a3) is 100 parts by mass; <EOS>