To avoid effects of change in a gloss of a surface of an object to be measured.

A large number of sensor elements comprised of electrostrictive polymers 1 and electrodes 2 and 3 each arranged on both sides of the electrostrictive polymers 1 are arranged in a plane. A shape measuring sensor is provided with a part for measuring electromotive voltage which occurs between both electrodes of each sensor element and comprises flexibility to follow the surface of the object to be measured. Shape measurement is performed from both locational information on each sensor element when the sensor is made to follow the surface of the object to be measured and height information acquired from the electromotive voltage of each sensor element.