Provided is an imaging device for acquiring three-dimensional information of a workpiece surface and a two-dimensional image. An imaging device comprises a visual sensor for acquiring a two-dimensional image after acquiring three-dimensional information of a workpiece surface. A position detection device is attached to the conveyor drive motor of a conveyor that conveys a workpiece. An image processing part calculates the amount of movement of the workpiece from when the three-dimensional information is acquired to when the two-dimensional image is captured on the basis of an output of the position detection device. The image processing part moves the three-dimensional information relative to the two-dimensional image in such a manner as to correspond to the amount of movement of the workpiece in a predetermined coordinate system.