A particulate nucleating agent comprising: at least one compound represented by the following General Formula, wherein a content of phosphate ions in the particulate nucleating agent, which is obtained by the following measurement procedure, is equal to or more than 5 ppm and equal to or less than 8,000 ppm based on a mass of the compound represented by the following General Formula, (measurement procedure) 1. the particulate nucleating agent is measured, 2. 100 parts by mass of xylene, 18 parts by mass of isopropyl alcohol, and 20 parts by mass of pure water with respect to 3 parts by mass of the compound represented by the General Formula are added to the particulate nucleating agent to obtain a mixture solution in a container, 3. the obtained mixture solution is stirred at room temperature for 15 minutes while ultrasonic waves are applied, 4. subsequently, the container is allowed to stand for 30 minutes to separate an organic layer and an aqueous layer, 5. the aqueous layer in the container is fractionated and water is distilled off completely, 6. 10 parts by mass of a 30 mmol/L potassium hydroxide aqueous solution with respect to 3 parts by mass of the compound represented by the General Formula is added to a residue in the container, and stirred for 15 minutes while ultrasonic waves are applied, 7. subsequently, the liquid in the container is filtered using a membrane filter having a pore size of 0.45 μm to obtain a filtrate, and then a concentration of the phosphate ions in the filtrate is quantified by ion chromatography, 8. on the basis of the concentration of the phosphate ions in the filtrate, a content of the phosphate ions (ppm) based on the mass of the compound represented by the General Formula is calculated, (in the General Formula, R 1 to R 4 each independently represent a hydrogen atom or a straight-chain or branched alkyl group having 1 to 9 carbon atoms, R 5 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, m represents 1 or 2, in a case where m is 1, M 1 represents a hydrogen atom, an alkali metal atom, or Al 2, and in a case where m is 2, M 1 represents an alkali earth metal atom, Al, or Zn). at least one compound represented by the following General Formula, wherein a content of phosphate ions in the particulate nucleating agent, which is obtained by the following measurement procedure, is equal to or more than 5 ppm and equal to or less than 8,000 ppm based on a mass of the compound represented by the following General Formula, (measurement procedure) 1. the particulate nucleating agent is measured, 2. 100 parts by mass of xylene, 18 parts by mass of isopropyl alcohol, and 20 parts by mass of pure water with respect to 3 parts by mass of the compound represented by the General Formula are added to the particulate nucleating agent to obtain a mixture solution in a container, 3. the obtained mixture solution is stirred at room temperature for 15 minutes while ultrasonic waves are applied, 4. subsequently, the container is allowed to stand for 30 minutes to separate an organic layer and an aqueous layer, 5. the aqueous layer in the container is fractionated and water is distilled off completely, 6. 10 parts by mass of a 30 mmol/L potassium hydroxide aqueous solution with respect to 3 parts by mass of the compound represented by the General Formula is added to a residue in the container, and stirred for 15 minutes while ultrasonic waves are applied, 7. subsequently, the liquid in the container is filtered using a membrane filter having a pore size of 0.45 μm to obtain a filtrate, and then a concentration of the phosphate ions in the filtrate is quantified by ion chromatography, 8. on the basis of the concentration of the phosphate ions in the filtrate, a content of the phosphate ions (ppm) based on the mass of the compound represented by the General Formula is calculated, 1. the particulate nucleating agent is measured, 2. 100 parts by mass of xylene, 18 parts by mass of isopropyl alcohol, and 20 parts by mass of pure water with respect to 3 parts by mass of the compound represented by the General Formula are added to the particulate nucleating agent to obtain a mixture solution in a container, 3. the obtained mixture solution is stirred at room temperature for 15 minutes while ultrasonic waves are applied, 4. subsequently, the container is allowed to stand for 30 minutes to separate an organic layer and an aqueous layer, 5. the aqueous layer in the container is fractionated and water is distilled off completely, 6. 10 parts by mass of a 30 mmol/L potassium hydroxide aqueous solution with respect to 3 parts by mass of the compound represented by the General Formula is added to a residue in the container, and stirred for 15 minutes while ultrasonic waves are applied, 7. subsequently, the liquid in the container is filtered using a membrane filter having a pore size of 0.45 μm to obtain a filtrate, and then a concentration of the phosphate ions in the filtrate is quantified by ion chromatography, 8. on the basis of the concentration of the phosphate ions in the filtrate, a content of the phosphate ions (ppm) based on the mass of the compound represented by the General Formula is calculated, (in the General Formula, R 1 to R 4 each independently represent a hydrogen atom or a straight-chain or branched alkyl group having 1 to 9 carbon atoms, R 5 represents a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, m represents 1 or 2, in a case where m is 1, M 1 represents a hydrogen atom, an alkali metal atom, or Al 2, and in a case where m is 2, M 1 represents an alkali earth metal atom, Al, or Zn).