Portable electronic apparatus having a cooling device

A portable apparatus includes a main body having at least one electric part, a heat transmitter mounted to the main body for connection with the electric part, a connection member connected to the heat transmitter and having a first connection part accessible from outside of the portable apparatus and which emits a driving heat transmitted from the heat transmitter, and a detachable accessory device which is disposed in contact with the first connection part. Accordingly, a driving heat generated inside the main body of the portable apparatus can be emitted to the outside, passing through the heat transmitter and the connection member in sequence, thereby improving cooling efficiency of the portable apparatus.