In an imaging apparatus, an imager generates an imaged picture by converting incident light from a subject that is incident via a focus lens. A setting unit sets, as a movement range for the focus lens, a range of focus lens positions corresponding to imaging magnifications where the rate of change in the imaging magnification lies within a fixed range from a basis, the basis being an imaging magnification corresponding to the position of the focus lens. A focus controller configured to conduct focus control with respect to the subject by moving the focus lens in the set movement range.