Problem to be solved: to provide a hydrophobic polymer particle based on natural derived ingredients as raw materials.Hydrophobic alginate particle group which is hydrophobic in alginate polyvalent metal salt, is a group of hydrophobic alginate particles whose water absorption per 100g is smaller than the amount of oil per 100 g of water.No selection【課題】天然由来成分を原料とした疎水性のポリマー粒子を提供する。【解決手段】アルギン酸多価金属塩を疎水化処理してなる疎水性アルギン酸粒子群であって、粒子100gあたりの吸水量が、粒子100gあたりの吸油量よりも小さいものである疎水性アルギン酸粒子群。【選択図】なし