The present invention removes the support material from a three-dimensional object precursor comprising a three-dimensional object and a support material comprising a (meth) acrylic acid copolymer having a hydrophilic monomer and a hydrophobic monomer as monomer units. A three-dimensional object precursor treating agent composition, wherein the three-dimensional object precursor treating agent composition comprises a secondary monoamine compound, a tertiary monoamine compound, a secondary diamine compound, and a tertiary diamine compound. A three-dimensional object precursor comprising at least one or more organic amine compounds selected from and having a total content of an alkali metal hydroxide and an alkali metal carbonate lower than that of the organic amine compound and less than 2.5% by mass It is a body treatment agent composition. ADVANTAGE OF THE INVENTION According to this invention, the three-dimensional object precursor processing-agent composition which can remove the support material containing a (meth) acrylic-acid type copolymer more rapidly than before can be provided.
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