A method for producing a three-dimensional multilayer object produces a three-dimensional multilayer object by partially applying energy to a conductive powder and thereby melting or sintering and curing the conductive powder. The method for producing a three-dimensional multilayer object includes: applying energy to the conductive powder to melt or sinter the conductive powder, and detecting a flaw in a surface layer portion of the cured three-dimensional multilayer object by relatively moving a probe, which is disposed spaced apart from the surface layer portion, with respect to the surface layer portion. The method contains an excitation step of generating an eddy current in the surface layer portion and detecting a change in a magnetic field of the surface layer portion.