A plug connector is provided which is configured to be mated with a receptacle connector. The plug connector has a housing, a terminal and a reinforcing metal member. The housing has an elongated protrusion and a protrusion end part. The protrusion extends in a longitudinal direction from the end part. The protrusion has an upper side and the end part has upper and end faces. The terminal is at least partially embedded in the protrusion. The metal member is configured to be connected to the end part. The metal member has a main body portion and an end plate portion. The main body portion covers at least a portion of the upper face of the end part. The main body portion has an embedded plate portion which is embedded in the end part. The end plate portion covers at least a portion of the end face of the end part.