1. A three-dimensional medical imaging apparatus for acquiring three-dimensional images of a subject, comprising: an image-acquisition optical system; and an imaging device, wherein conditional expressions (1) and (2) are satisfied 
 100≦WD≦500  (1) 
 9°≦2θ≦45°  (2) where WD is the working distance of the three-dimensional medical imaging apparatus in millimeters and θ is the half field angle of the image-acquisition optical system.