Disclosed is a pen-like input device for a portable terminal which can provide the function of a wireless headset. The input device includes a housing configured with at least first and second spaced apart microphone holes formed therein. A transmitting/receiving (T/R) module is disposed inside the housing and coupled to the microphone element and a speaker. The T/R module transmits / receives communication signals to and from the portable terminal. A sound transferring part is provided within the housing to transfer sounds to a microphone element via a plurality of air pathways connected to the first and second microphone holes.