A semiconductor device including a plurality of solder balls on a surface the semiconductor device, and a retaining body associated with a first solder ball of the plurality of solder balls, separating the first solder ball from at least a second solder ball of the plurality of solder balls. The retaining body includes a conductive portion and an insulating portion configured to cover the conductive portion. Also, a method of manufacturing a semiconductor device, including acts of forming a plurality of retaining bodies on a surface of a wiring substrate, each retaining body comprising a conductive portion and an insulating portion covering the conductive portion, each retaining body forming an opening section, and forming a solder ball in the opening section formed by each of the retaining bodies.