A method for producing a porous metal body, the method being characterized in comprising: a step for forming an electroconductive covering layer by applying a coating on at least a skeleton surface of a porous resin in the form of a three-dimensional mesh, the coating containing at least one type of microparticle selected from the group consisting of metallic microparticles and metallic oxide microparticles having a volume-average grain size of 10 mum or less, and a carbon powder having a volume-average grain size of 10 mum or less; a step for forming at least one type of metal plating layer; and a step for using a heat-treatment to remove the three-dimensional-mesh-form resin, reduce the metal microparticles or metallic oxide microparticles and the metal plating layer, and carry out heat diffusion.