To realize an analysis technology that can predict the centering behavior of the elastic belt suspended by crowning roller more accurately, we examined the relationship between the centering action of the belt and the shape of the crowning roller, and the tension, etc., in detail by experiments. And we also studied the analysis method that can predict a deformation of the belt suspended by crowning roller using Timoshenko Beam theory. We found that (1) the radius of curvature of the crowning roller, the roller diameter, the distance between axis, and the tension acting on the belt affect the centering action of the belt, (2) The width of the belt does not significantly affect the centering action of the belt, and (3) The analytical model considering the effect of the tension is necessary to predict the centering action of the belt accurately.