A method for producing a hair cosmetic, comprising the following steps (I) to (III): Step (I): a step of mixing a cationized hydroxypropyl cellulose (A) and an anionic surfactant (C') to prepare a mixture, Step (II): a step of mixing the mixture obtained in the step (I) with an oil (B) to prepare an emulsion, Step (III): a step of mixing the emulsion obtained in the step (II) with a surfactant (C) and water to give a hair cosmetic, wherein the oil (B) has an amount of dissolution in 100 g of water at 20°C of 0 to 1 g, and wherein the cationized hydroxypropyl cellulose (A) has an anhydroglucose-derived main chain represented by the following general formula , and has a degree of substitution with cationized ethyleneoxy group of from 0.01 to 2.9 and a degree of substitution with propyleneoxy group of from 0.1 to 4.0: wherein, in the formula , R 1 , R 2 and R 3 each independently represent a substituent having a cationized ethyleneoxy group and a propyleneoxy group represented by the following general formula ; n indicates a mean degree of polymerization of anhydroglucose and is a number of from 50 to 5000, wherein, in the formula , one of Y 1 and Y 2 is a hydrogen atom and the other is a cationic group represented by the following general formula ; PO represents a propyleneoxy group; p indicates the number of cationized ethyleneoxy groups ((-CH(Y 1 )-CH(Y 2 )-O-) in the general formula and q indicates the number of propyleneoxy groups (-PO-) therein, each representing 0 or a positive integer; in case where both of p and q are not 0, the addition sequence of the cationized ethyleneoxy group and the propyleneoxy group is not defined, and in case where p and/or q are/is 2 or more, a binding form may be any of like a block co-polymer or like a random co-polymer, wherein, in the formula , R 4 , R 5 and R 6 each independently represent a linear or branched alkyl group having from 1 to 3 carbon atoms, and X - represents an anionic group. Step (I): a step of mixing a cationized hydroxypropyl cellulose (A) and an anionic surfactant (C') to prepare a mixture, Step (II): a step of mixing the mixture obtained in the step (I) with an oil (B) to prepare an emulsion, Step (III): a step of mixing the emulsion obtained in the step (II) with a surfactant (C) and water to give a hair cosmetic, wherein the oil (B) has an amount of dissolution in 100 g of water at 20°C of 0 to 1 g, and wherein the cationized hydroxypropyl cellulose (A) has an anhydroglucose-derived main chain represented by the following general formula , and has a degree of substitution with cationized ethyleneoxy group of from 0.01 to 2.9 and a degree of substitution with propyleneoxy group of from 0.1 to 4.0: wherein, in the formula , R 1 , R 2 and R 3 each independently represent a substituent having a cationized ethyleneoxy group and a propyleneoxy group represented by the following general formula ; n indicates a mean degree of polymerization of anhydroglucose and is a number of from 50 to 5000, wherein, in the formula , one of Y 1 and Y 2 is a hydrogen atom and the other is a cationic group represented by the following general formula ; PO represents a propyleneoxy group; p indicates the number of cationized ethyleneoxy groups ((-CH(Y 1 )-CH(Y 2 )-O-) in the general formula and q indicates the number of propyleneoxy groups (-PO-) therein, each representing 0 or a positive integer; in case where both of p and q are not 0, the addition sequence of the cationized ethyleneoxy group and the propyleneoxy group is not defined, and in case where p and/or q are/is 2 or more, a binding form may be any of like a block co-polymer or like a random co-polymer, wherein, in the formula , R 4 , R 5 and R 6 each independently represent a linear or branched alkyl group having from 1 to 3 carbon atoms, and X - represents an anionic group. <EOS>