To provide a metal porous body having desired fine pores, especially the fine pores of a nanometer order, with a simple method.

This method for producing a metal porous body includes: a step of preparing a first metal particles which are metal particles containing a first metal material and an average particle diameter of the metal particles is within the range of 50 nm to 1 μm and a metal salt or a metal complex which is a precursor of a second metal particles containing a second metal material; a step of obtaining a mixture by mixing the first metal particles and the metal salt or the metal complex; and a metal porous body generating step of generating the second metal material in the metal salt or the metal complex as the second metal particles by heating the mixture and obtaining a metal porous body by bonding the first metal particles using the second metal particles as a binder.