Patent ID: 8383016

Claim:
A conductive fine particle comprising: a core particle, a metal-plated coating film layer containing nickel and phosphorus formed on the surface of the core particle, and a palladium layer formed on the surface of the metal-plated coating film layer facing away from the core particle, wherein the phosphorus content of the metal-plated coating film layer, in region A at distance from the surface of the metal-plated coating film layer on the core particle side of no greater than 20% of a thickness of the entire metal plated coating film layer, is 7-15 wt% with respect to the entire region A, the phosphorus content of the metal-plated coating film layer, in region B at a distance from the surface of the metal- plated coating film layer on the palladium layer side of no greater than 10% of the thickness of the entire metal-plated coating film layer, is 0.1-3 wt % with respect to the entire region B, the phosphorus content is 7 wt % or greater with respect to the entire metal-plated coating film layer.