Provided are: a curing agent paste of which the occurrence of self-curing can be prevented for a long period when the curing agent paste is stored hermetically in a packaging container a method for producing the curing agent paste and an alginate impression material kit for dental use. The curing agent paste according to the present invention contains (A) a calcium sulfate component containing calcium sulfate dehydrate, (B) a poorly-water-soluble liquid compound and (C) a surfactant as the main components and has a water content of 0.05 mass% or less.
