A shaped article production method includes: fabricating an intermediate article by powder bed fusion using a powder of a gamma prime precipitation strengthening Ni-based alloy; and heat-treating the intermediate article. The Ni-based alloy contains, in percent by mass, 7.0 to 17.0% Cr, 7.0 to 12.0% Co, 5.0 to 8.0% Al+Ti, 2.0 to 12.0% W, 1.5 to 4.4% Nb+Ta, 2.3% or less Mo, 0.3% or less C, 2.0% or less Hf, and 0.2% or less Zr. The fabricating the intermediate article includes applying a laser beam to a layer (3) of the powder along scan lines (4) parallel to one another. In applying the laser beam, a value obtained by dividing a pitch between the scan lines (4) by a laser spot diameter is in the range of 0.6 to 1.1.