An apparatus for measurement of a three-dimensional shape includes a light source, a beam splitter splitting a light emitted from the light source, a measured object projected with the light from the light source, having a height difference between a highest point and a lowest point thereof, a reference plane projected with the light emitted from the beam splitter, a photographing device photographing an interference fringe formed by the lights reflected from a surface of the measured object and from the reference plane and composed, and a controlling computer processing the image photographed by the photographing device. The reference plane further includes a reflection path adjusting unit which supplies reflection paths respectively equal to a reflection path from the highest point and a reflection path from the lowest point of the measured object.