The method for producing hydrogel particles includes a cooling step in which an aqueous solution in which a gel agent that forms a non-crosslinked hydrogel is dissolved is cooled to a temperature lower than the gel point of the aqueous solution. In the cooling step, the coolant of the aqueous solution is stirred at least at the gelation point, and after reaching the gel point, the cooling power of the aqueous solution has a required power for stirring per unit volume of 0.8 kW / Stirring energy of 400 kW × second / m3 or more is given by stirring of m3 or more.ハイドロゲル粒子の製造方法は、非架橋型ハイドロゲルを形成するゲル剤を溶解させた水溶液を、前記水溶液のゲル化点よりも低い温度まで冷却する冷却工程を含む。前記冷却工程において、少なくとも前記ゲル化点では前記水溶液の冷却物を撹拌し、且つ前記ゲル化点に達した以後に、前記水溶液の冷却物に、単位体積当たりの撹拌所要動力が０．８ｋＷ／ｍ３以上の撹拌により４００ｋＷ×秒／ｍ３以上の撹拌エネルギーを与える。
