A laptop computer includes a main body, a display, a component, and a frame. The main body includes a front end, a back end opposite to the front end, a left side surface and a right side surface connected between the front end and the back end, and a socket positioned at the back end. The display is pivoted to the front end of the main body. The component is detachably inserted into the socket. The frame is movably connected to the left side surface and the right side surface. The frame is able to rotate between a locked position and an unlocked position, when the frame is at the locked position, the frame keeps the component in the socket, and when the frame is at the unlocked position, the component is able to be pulled out from the socket.