PROBLEM TO BE SOLVED: To provide a heating-type hair setting treatment method capable of making hair-waving set, and straight-set and hair correction etc. through eliminating strains inside the hair such as wavy hair and curly hair, by producing tannin linkages among the polypeptide chains of the hair using odorless and highly safe tannin, compared to cold perming treatment as a current method with a highly concentrated mercaptan-based reducing agent emitting intense odor as the main agent.SOLUTION: A heating-type hair setting treatment method of the present invention is a hair setting method by producing tannin linkages instead of the recombination of a cystine between the polypeptide chains of the hair, and comprises: a step of applying, to the hair, a tannin crosslinker containing tannin, as a main agent, obtained by oligomerizing in the alkaline range of pH 8-10, and further activating by reducing action with a sulfite and a step of applying a weak acidic neutralizer to the hair treated by the tannin crosslinker.
