A call informing apparatus is provided. The call informing apparatus includes a call detecting unit and a call informing unit. The call detecting unit includes an external light shielding cap that shields external light, a sensing module with an optical sensor sensing light from a display panel or a call informing lamp of a portable terminal, a first controller that generates a call reception signal, and a wireless transmitter that transmits the reception signal. The call informing unit includes a wireless receiver for receiving the reception signal, a second controller for controlling an indicating lamp to emit light, and the indicating lamp. Therefore, a user can easily and visually recognize reception of an incoming call in noisy environment, or even when riding a motorcycle.