A portable computer system having a computer body and a display unit coupled to the computer body includes a docking station to be connectable to and disconnectable from the computer body, a heat discharging member provided on the computer body to cool a heat generating component mounted on the computer body, at least one first heat transmission member provided on the computer body and connected to the heat discharging member to be in contact with the docking station, and at least one second heat transmission member provided on the docking station to be in contact with the first heat transmission member and to discharge heat from the computer body. Thus, the portable computer system is capable of discharging the heat generated from the computer body through the docking station.