1. A form measuring apparatus configured to perform measurement of a surface form of a surface of an object having a three-dimensional form, the apparatus comprising: a detecting section which is configured to perform detection of the surface form of the object having the three-dimensional form; and an area-setting section which is configured to set, as a measurement area, an outside area located outside of a designated area, based on form information of a form of the designated area, wherein the detecting section is configured to perform the detection at first for the measurement area located outside of the designated area and thereafter to perform the detection for the designated area.