Three-dimensional shaped article production method

A three-dimensional shaped article production method that is a three-dimensional shaped article production method for producing a three-dimensional shaped article by stacking layers, comprising:

• a first metal powder supply step of supplying a first metal powder having a first average particle diameter to a shaping table;
• a layer formation step of forming the layer by compressing the first metal powder supplied to the shaping table;
• a first liquid supply step of supplying a first liquid containing a binder and a second metal powder having a second average particle diameter that is an average particle diameter 1/10 or more and ½ or less the first average particle diameter to a portion of a constituent region wherein being a region where the three-dimensional shaped article is formed in the layer, and wherein containing a surface layer region that is an outline of the three-dimensional shaped article and an internal region other than the surface layer region in the constituent region;
• a second liquid supply step of supplying at least either a second liquid containing the binder and the second metal powder, in which a concentration of the second liquid is lower than that of the first liquid, or a third liquid containing the binder and a third metal powder having a larger average particle diameter than the second average particle diameter to at least a portion of the surface layer region;
• and
• a sintering step of sintering a metal in the constituent region by heating a stacked body of the layers.