A touch operation input device that allows input by a touch operation to a display screen, has a touch operation detector for detecting a touch operation; an operation processor for performing a process by determining operated content based on a detection result of the touch operation detector; a menu processor for performing a menu displaying process and a process of a menu item, based on a determination result of the operation processor; an image processor for performing a process of generating a drawn image on a touched portion when in a drawing mode; and a display controller for performing control of display on a display screen. When the operation processor has determined the touch operation as an operation for a menu process, the image processor performs a process of erasing the drawn image drawn by the touch operation even in the drawing mode.