A socket connector comprises a housing, a shield covering the housing and a detecting switch mounted in the housing. The housing includes a base and a pinboard having a first board surface and a second board surface. An eSATA terminal set having seven terminals side by side is mounted on the first board surface. An USB terminal set having nine terminals is mounted on the second board surface and five terminals are connected to the five middle terminals of the eSATA terminal set to form a shared terminal structure. The shield has a shared inserting room which includes a first inserting room for connecting an eSATA plug connector and a second inserting room for connecting an USB plug connector, the second inserting room having a nonoverlapping space relative to the first inserting room. The detecting switch includes a first detecting terminal that extends into the nonoverlapping space.