To provide a method for producing mixed powder, by which raw material powder such as wheat flour, sucrose, and the like can directly be mixed to produce the mixed powder containing a pasty foaming agent used for cakes, having high generality, and capable of being easily handled.

This method for producing the mixed powder, comprising compounding mixed powder raw material power with a water-containing foaming agent, is characterized by preliminarily mixing a part of the mixed powder raw material power with the water-containing foaming agent and then uniformly crushing and mixing the obtained preliminary mixture with the residual raw material power.