Shape measuring device

A shape measuring device comprising:

• a holder configured to hold a measuring target having a measurable shape;
• a first measurement circuit configured to measure relative coordinates of a plurality of measurement points on a first surface of the measurement target with respect to a defined point;
• a second measurement circuit configured to operate independently from the first measurement circuit and measure relative coordinates of a plurality of measurement points on a second surface of the measurement target, which is a reverse surface of the first surface, with respect to the defined point;
• and
• calculation circuitry configured to:
• calculate a shape of the measurement target on the basis of results measured by the first measurement circuit and the second measurement circuit,
• use the data measured by the first measurement circuit to obtain an equation of a plane from a group of points on the first surface,
• obtain a center of gravity from a group of points on the second surface using the data measured by the second measurement circuit, and
• obtain a thickness of the measuring target from the equation of the plane and the center of gravity.