A terminal assembly includes a contact terminal having a base board, a driven terminal having a retention portion and an insulating block. Two opposite ends of the base board form a pair of contact portions located at one side of the base board for contacting a corresponding external terminal group. A portion of an edge of the retention portion extends to form an elastic arm. The insulating block is integrated with the contact terminal and the driven terminal by means of a substantial middle portion of the base board and a free end of the elastic arm being integrated in the insulating block. The base board of the contact terminal and the elastic arm of the driven terminal are intersected with and non-contacting with each other.