An inward-opening type casement window having outward-opening pane and screen is provided. A primary screen is installed, via a first hinge, in a primary casement window frame so as to open inwardly. The primary screen is formed with a secondary frame. A secondary pane is installed, via a second hinge, in the secondary frame so as to open outwardly. A handle lock is installed between the primary screen and the primary casement window frame and between the secondary pane and the secondary frame. The handle lock is used to control opening and closing of the primary screen and the secondary pane. The pane can be swung out to facilitate ventilation, and the screen can prevent entry of insects and burglars. Moreover, the pane can be swung in together with the screen, thereby facilitating access, ventilation and cleansing.