When a shape of an end face of a disc-shaped measurement target is to be measured on the basis of its projection image, a shape measuring device in which a non-parallel light component is not contained in a light flux projected to the measurement target as much as possible and moreover, correct shape measurement can be made by ensuring parallelism between a light projection direction and each face of front and back sides of the measurement target.There are provided a collimator lens 3 for having outgoing light of a point light source 2 pass and collimating the same in a light projection direction R1 and a single or a plurality of apertures 8 shielding passage of light in a range outside an image pickup range of a camera seen from the light projection direction R1 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 in the light projection direction R1 in the light flux traveling from the collimator lens 3 to the measurement target 1 side. Moreover, a parallel supporting portion 21 for supporting one of the faces of the measurement target 1 in parallel with the light projection direction R1 at a position on the center side with respect to the measurement portion in the measurement target 1 supported by a center sucking and supporting mechanism 9 is provided.