A structure securely attaches a component to an opening portion in a plate-shaped member without stripping or turning over the member. Each of a pair of mount members includes a first engagement portion engaged with a rear surface of the plate-shaped member and a second engagement portion engaged with the component. The component includes projecting portions to be fitted between the mount members, thus the component can be fixed against coming off by engagement of the second engagement portion and the component. The projecting portions inhibit the mount members engaged with the opening portion from moving, thereby preventing the mount members from coming off the opening portion. Since the fitting member is fitted between the second engagement portions, the fitting member inhibits the second engagement portions from moving to come closer to each other, and from disengagement from the component, thereby more securely preventing the component from coming off.