A signal connector comprises a main body for receiving a coaxial cable, thereby conducting electric connection between the signal connector and the coaxial cable; a first mounting portion coupled to and extending from the main body in a first direction and having a first mounting surface attachable to a circuit board; and a first coupling member coupled to the first mounting portion and protruding from the first mounting surface to be inserted into a hole in the circuit board, thereby securing the signal connector on the circuit board. The aforementioned structure makes the signal connector resistant to frequent plugging/unplugging actions.