Abstract: One embodiment of the present invention is a production method for a three-dimensional shaped article, the method comprising the following: a mixing step for obtaining a dissimilar metal mixed powder by mixing a first metal powder (P1) and a second metal powder (P2) different from the first metal powder (P1); and a shaping step for sintering, or melting and solidifying, the dissimilar metal mixed powder obtained in the mixing step. Based on the part of the three-dimensional shaped article to be produced, the mixing ratio of the first metal powder (P1) and the second metal powder (P2) is changed in the mixing step.