a shape measurement apparatus capable of saving time and effort of an examiner and improving measurement accuracy . the apparatus for measuring a spherical shape of an object to be examined comprising a measurement unit where a first projection optical system projects first targets for measurement onto a spherical surface to be measured , a first detection optical system detects images of the projected first targets and a calculation unit obtains a shape of the surface based on the detected images , an output unit which outputs the obtained shape , a mode setting unit which sets any one of a first measurement mode for a convex shape and a second measurement mode for a concave shape , and a condition setting unit which sets at least one of a measurement condition and an output condition based on a mode setting result , the conditions being different between the first and second measurement modes .