Image acquisition device and image acquisition method for image acquisition device

In this image acquisition device, a stage driving unit moves a position of a field of view of an objective lens relative to a sample at a predetermined velocity, and a two-dimensional imaging element sequentially captures an optical image of the sample at a predetermined frame rate. Therefore, time required for acquiring partial images over the entire sample is shortened. Further, in this image acquisition device, the moving velocity of the position of the field of view is a velocity set based on a frame rate of the imaging element. Therefore, the movement of the position of the field of view and the imaging of the imaging element are synchronized with each other, and it is possible to capture only necessary partial images.