A noise reduction apparatus of a mobile terminal improves reception sensitivity by creating a electrical closed loop. The mobile terminal has a main circuit board and a slide hinge. The mobile terminal also includes a flexible printed circuit board (FPCB) that includes a first end coupled to the main circuit board and a second end fixed and coupled to a portion of an upper surface of the slide hinge. A noise reduction apparatus is installed between the main circuit board and the slide hinge to form an electronic closed loop that includes the main circuit board, the FPCB, the slide hinge, and the noise reduction apparatus. Noise is reduced by inducing noise abandoned to a slide hinge through a FPCB to an electrical close loop formed by the noise reduction apparatus, thereby improving reception sensitivity.