A steel sheet shape control method includes, (A) setting a target correction shape of the steel sheet at a position of an electromagnet to a curved shape, (B) measuring a steel sheet shape when electromagnetic correction is performed, (C) calculating the steel sheet shape in a nozzle position based on the steel sheet shape, (D) repeating (B) and (C) by resetting the target correction shape to a curved shape having a smaller amount of warp, (E) when the amount of warp of the steel sheet shape at the position of the nozzle is less than the upper limit value, (F) calculating vibration of the steel sheet at the position of the nozzle, and (G) adjusting a control gain of the electromagnet until amplitude of vibration is less than a second upper limit value when the amplitude of the vibration is equal to or more than the second upper limit value.

To downsize a curved transport route through which a transport target is transported without being deformed. A transport path 401 includes a first curved transport tubular-body unit 415B having a first curved shape in which a bottom surface 411B located beside an air blowing tube 100 bulges into a convex shape toward the air blowing tube. The first curved transport tubular-body unit is configured to increase a distance H between the bottom surface and a top surface 413B opposite to the bottom surface from each end portion toward an intermediate portion in a transport direction x to prevent a banknote P retained by a transport body 500 from coming into contact with the top surface.