Shape measurement device

A shape measurement device comprising:

• a light irradiation unit which irradiates linear light onto a work;
• an imaging element which images reflected light of the light irradiated from the light irradiation unit, the reflected light being reflected by the work;
• and
• an image-forming lens which forms an image of the reflected light reflected by the work on an imaging plane of the imaging element, wherein
• a light irradiation plane of the light irradiation unit, a principal plane including a principal point of the image-forming lens, and the imaging plane of the imaging element satisfy a Scheimpflug principle, wherein
• the shape measurement device further comprises:
• an image obtaining region selection unit which divides the imaging plane of the imaging element into a plurality of regions, and selects, as an image obtaining region, a region for use in measurement from the plurality of regions in response to at least one of measurement accuracy and a size of a measurement range.