An imaging device comprising: an imaging element (12) which is disposed in a position offset from the center of the field of view of an objective optical system (11) and images an optical image formed by the objective optical system (11) to generate an image; an cut-out range setting unit (35) which sets a cut-out area such that the center thereof approaches the center of the field of view as the zoom magnification set by an electronic zoom setting unit (33) increases; and a zoom processing unit (36) which cuts out the set cut-out area from the image and enlarges or shrinks the same in accordance with the zoom magnification to generate a zoom image.