The three-dimensional object precursor treatment agent composition according to the present invention is for removing, from a three-dimensional object precursor containing a water-soluble support material and a three-dimensional object that contains a resin, the water-soluble support material. The three-dimensional object precursor treatment agent composition contains a compound (component A) represented by formula (I), an anionic surfactant (component B), and water (component C). Component B has an alkyl group having 6-20 carbon atoms, and an acidic group. According to the present invention it is possible to provide: a three-dimensional object precursor treatment agent composition capable of removing a water-soluble support material while inhibiting damage to a three-dimensional object and discoloration of the three-dimensional object due to such damage; a production method for the three-dimensional object; a method for removing a support material; and a method for inhibiting damage to a three-dimensional object. (In formula (I), R1, R2, R3, and R4 each independently represent a hydrocarbon group).
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