A terminal pin includes a pin body and an elastic latch. The pin body has a first end and a second end. The elastic latch is connected to the pin body and normally protrudes from the pin body with a stopping tip extending toward the second end. An electrical connector is also provided, which includes a base and the terminal pin. The base includes an accommodating aperture defined through the base. A notch is formed in the accommodating aperture and recessed from an inner wall of the accommodating aperture. The notch includes a stopping surface. The terminal pin is inserted into the accommodating aperture with the stopping tip of the elastic latch abutted against the stopping surface.