A method for producing a polymer latex, comprising: a polymerization step of polymerizing a monomer in an organic solvent to thereby obtain a polymer solution of synthetic polyisoprene and/or a styrene-isoprene-styrene block copolymer; an antioxidant addition step of adding an antioxidant to the polymer solution of synthetic polyisoprene and/or a styrene-isoprene-styrene block copolymer at a proportion of 0.01 to 1.00 parts by weight per 100 parts by weight of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer; and an emulsification step of emulsifying the polymer solution to which the antioxidant is added, in water in the presence of a surfactant, to thereby obtain a polymer latex; wherein the weight average molecular weight (Mw) of the synthetic polyisoprene is 100,000 to 1,200,000, the weight average molecular weight (Mw) of the styrene-isoprene-styrene block copolymer is 50,000 to 500,000, the emulsification is performed in the emulsification step so that a ratio D75/D25 of a volume particle size D75 at a cumulative frequency of 75% to a volume particle size D25 at a cumulative frequency of 25% of a particle of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer included in the polymer latex is 1.90 or more and 2.30 or less, the volume particle size D25 at a cumulative frequency of 25% and the volume particle size D75 at a cumulative frequency of 75% mean the particle size at a cumulative frequency of 25% on a volume basis and the particle size at a cumulative frequency of 75% on a volume basis, respectively, and are defined as the particle size at a cumulative volume of 25% and the particle size at a cumulative volume of 75%, respectively, obtained by measuring the particle size distribution according to a light scattering diffraction method and conducting calculation from the smaller size in the particle size distribution measured, and the weight average molecular weight (Mw) is a value in terms of standard polystyrene by gel permeation chromatography analysis. a polymerization step of polymerizing a monomer in an organic solvent to thereby obtain a polymer solution of synthetic polyisoprene and/or a styrene-isoprene-styrene block copolymer; an antioxidant addition step of adding an antioxidant to the polymer solution of synthetic polyisoprene and/or a styrene-isoprene-styrene block copolymer at a proportion of 0.01 to 1.00 parts by weight per 100 parts by weight of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer; and an emulsification step of emulsifying the polymer solution to which the antioxidant is added, in water in the presence of a surfactant, to thereby obtain a polymer latex; wherein the weight average molecular weight (Mw) of the synthetic polyisoprene is 100,000 to 1,200,000, the weight average molecular weight (Mw) of the styrene-isoprene-styrene block copolymer is 50,000 to 500,000, the emulsification is performed in the emulsification step so that a ratio D75/D25 of a volume particle size D75 at a cumulative frequency of 75% to a volume particle size D25 at a cumulative frequency of 25% of a particle of the synthetic polyisoprene and/or styrene-isoprene-styrene block copolymer included in the polymer latex is 1.90 or more and 2.30 or less, the volume particle size D25 at a cumulative frequency of 25% and the volume particle size D75 at a cumulative frequency of 75% mean the particle size at a cumulative frequency of 25% on a volume basis and the particle size at a cumulative frequency of 75% on a volume basis, respectively, and are defined as the particle size at a cumulative volume of 25% and the particle size at a cumulative volume of 75%, respectively, obtained by measuring the particle size distribution according to a light scattering diffraction method and conducting calculation from the smaller size in the particle size distribution measured, and the weight average molecular weight (Mw) is a value in terms of standard polystyrene by gel permeation chromatography analysis.