To provide metallic particles which have a nanometric average diameter, have sufficient electroconductivity, have high stability, and can be suitably used for a catalyst material, an electroconductive paste and an ink material.

The method for producing the metallic nanoparticles includes reacting a solution containing a metal salt of an organic acid and an amine with a reducing agent. The colloid of the particle is prepared by dispersing the obtained particles in an organic solvent. The paste and powder of the particle are also prepared by using the particles obtained through the method.