The electromagnetic levitation technology which an object grips and transport without contact is focused, and actively considered in various approach. Considering stability of levitated object, the levitation method which inclueds mechanical properties of levitated structure is also considered. Application of the levitation technology in manufacture process for thin steel plate is demanded for enhancement surface quolity of products. However, the elastic vibration of steel plate is excited because of flexibility, and prevent stable levitation. To solve this problem, we have proposed a levitation method for an ultrathin steel plate that is bent to the extent that the plate does not induce plastic deformation. It has been confirmed that vibrations are suppressed and levitation performance is improved. In this study, we applied sliding mode control theory to the bending levitation system using continuous model, and carried out levitation experiments. These results show that applying sliding mode control theory further improve levitation performance.