A shape measuring device including a light projecting device for projecting a light flux to a measurement portion, and image pickup device for picking up a projection image of the measurement portion. The light projecting device includes a collimator lens having outgoing light of a point light source pass and collimating the same in a light projection direction and one or more apertures shielding passage of light in a range outside an image pickup range or passage of light in a range inside the image pickup range and outside a boundary located in a range outside a projection image of a measurement portion. Moreover, a parallel supporting portion for supporting a face of the measurement target in parallel with the light projection direction at a position on the center side with respect to the measurement portion in the measurement target supported by a center sucking and supporting mechanism is provided.