A method for producing a 1-substituted-3-fluoroalkylpyrazole-4-carboxylic acid ester represented by the following general formula, the method comprising: a step of adding, to a first reaction liquid containing an alkyl hydrazine represented by the following general formula and a first organic solvent, a second reaction liquid containing an acyl acetic acid ester derivative represented by the following general formula and a second organic solvent in 0.5 to 30 hours to react the first reaction liquid with the second reaction liquid at a reaction temperature of -5 to 80°C under stirring in the absence of a base and an acid, wherein the first organic solvent and the second organic solvent are each at least any one of benzene, toluene, xylene, chlorobenzene, dichlorobenzene, ethyl acetate, butyl acetate, and dimethyl carbonate, a total mass of the first organic solvent and the second organic solvent is 1 to 60 times a mass of the acyl acetic acid ester derivative, and an amount of the first organic solvent in a total amount of the first organic solvent and the second organic solvent is 40 to 95% by mass. R 1 -NHNH 2 (in the general formula, R 1 represents a C1-C6 alkyl group which may be substituted) (in the general formula, R 2 represents a hydrogen atom or a halogen atom, R 3 represents a hydrogen atom, a fluorine atom, or a C1-C12 alkyl group which may be substituted with a chlorine atom or a fluorine atom, and R 4 and R 5 each independently represent a C1-C6 alkyl group) (in the general formula, R 1 represents a C1-C6 alkyl group which may be substituted, R 2 represents a hydrogen atom or a halogen atom, R 3 represents a hydrogen atom, a fluorine atom, or a C1-C12 alkyl group which may be substituted with a chlorine atom or a fluorine atom, and R 4 represents a C1-C6 alkyl group) a step of adding, to a first reaction liquid containing an alkyl hydrazine represented by the following general formula and a first organic solvent, a second reaction liquid containing an acyl acetic acid ester derivative represented by the following general formula and a second organic solvent in 0.5 to 30 hours to react the first reaction liquid with the second reaction liquid at a reaction temperature of -5 to 80°C under stirring in the absence of a base and an acid, wherein the first organic solvent and the second organic solvent are each at least any one of benzene, toluene, xylene, chlorobenzene, dichlorobenzene, ethyl acetate, butyl acetate, and dimethyl carbonate, a total mass of the first organic solvent and the second organic solvent is 1 to 60 times a mass of the acyl acetic acid ester derivative, and an amount of the first organic solvent in a total amount of the first organic solvent and the second organic solvent is 40 to 95% by mass. R 1 -NHNH 2 (in the general formula, R 1 represents a C1-C6 alkyl group which may be substituted) (in the general formula, R 2 represents a hydrogen atom or a halogen atom, R 3 represents a hydrogen atom, a fluorine atom, or a C1-C12 alkyl group which may be substituted with a chlorine atom or a fluorine atom, and R 4 and R 5 each independently represent a C1-C6 alkyl group) (in the general formula, R 1 represents a C1-C6 alkyl group which may be substituted, R 2 represents a hydrogen atom or a halogen atom, R 3 represents a hydrogen atom, a fluorine atom, or a C1-C12 alkyl group which may be substituted with a chlorine atom or a fluorine atom, and R 4 represents a C1-C6 alkyl group)