A laser beam (L50) is reflected by a light-beam scanning device (60) and shined onto a holographic recording medium (45). Using the reference light that converges at the origin (B) of the scan, an image (35) of a linear scatterer is recorded on the holographic recording medium (45) as a hologram. The light-beam scanning device (60) bends the laser beam (L50) at the aforementioned origin (B) and shines said laser beam onto the holographic recording medium (45). When doing so, the manner in which the laser beam is bent is changed over time, thereby changing, over time, the position on the holographic recording medium (45) illuminated by the bent laser beam (L60). Diffracted light (L45) from the holographic recording medium (45) forms a reproduced image (35) of the abovementioned linear scatterer on a light-receiving surface (R) of a stage (210). Hologram reconstruction light thus causes a linear pattern to be projected, and when an object is placed on the light-receiving surface (R), the projected image is imaged in order to measure the three-dimensional shape of the object.