Provided is a novel lump formation-preventing agent. An agent for preventing the formation of lumps from a thickening polysaccharide, said agent comprising at least one component selected from the group consisting of lysine, aspartic acid and salts thereof.本發明係提供新穎的粉塊形成抑制劑。一種增黏多醣類的粉塊形成抑制劑,其係包含選自離胺酸及天冬胺酸以及該等之鹽所組成群組之至少一種。