A portable computer having a main board; an antenna receiving and transmitting an RF signal; a PCI slot part provided in the main board and receiving the RF signal received and transmitted through the antenna; a wireless LAN card including a main card removably inserted into the PCI slot part, and an RF connector provided at a side of the main card and through which the RF signal is inputted/outputted between the antenna and the PCI slot part; and an antenna connecting part connected to the RF connector and allowing the RF signal to be inputted/outputted through the RF connector between the antenna and the PCI slot part when the wireless LAN card is inserted into the PCI slot part. With this configuration, the present invention provides a portable computer improved in a mounting structure of a wireless LAN card doing not have an antenna.