A method of fabricating a wiring board includes forming a surface plating layer on a support member, and forming an external connecting pad on the surface plating layer formed on the support member such that an area of the external connecting pad formed on the surface plating layer is smaller than an area of the surface plating layer. The method also includes forming an insulating layer and a wiring layer on a surface of the support member where the external connecting pad is formed, and removing the support member.