The present invention provides coated silver nanoparticles for use as an electrically conductive material capable of sintering at lower temperatures that is able to be used even with flexible printed substrates having low heat resistance, and a manufacturing method therefor. The coated silver nanoparticles of the present invention have a mean particle diameter of 30 nm or less and are coated with protective molecules amine, and are characterized in that the weight loss rate when heated to 160° C. in thermogravimetric measurement is 30% or more. The coated silver nanoparticles of the present invention are also characterized in that a silver-colored sintered film can be formed by sintering at a temperature of 100° C. or lower for 1 hour or less. These coated silver nanoparticles are manufactured by mixing a silver compound that forms metallic silver when decomposed by heating, an alkylamine and an alkyldiamine to prepare a complex compound, and by thermally decomposing the silver compound by heating the complex compound.