A laptop computer includes a host, a hinge mechanism, and a display. The host includes a housing, a pivoting base, and a protection cover that pivots on the pivoting base. The hinge mechanism is connected to the host, and includes a first shaft disposed in the housing, and a connection element connected to the first shaft. The display is connected to the hinge mechanism. When the display is rotated about the host, the connection element is rotated following the first shaft and makes the protection cover rotating relative to the housing.