An imaging device includes a lens that guides, to an imaging element, light reflected from a subject, a wearing tool for wearing at least the lens on a wearing target, and at least one processor. The processor determines whether a first condition based on a positional relationship of the lens with respect to the wearing target is satisfied, determines whether a second condition that includes a condition based on the positional relationship of the lens with respect to the wearing target is satisfied, the second condition differing from the first condition, and makes an imaging parameter of at least one of the imaging element or the lens for when the first condition is satisfied and for when the second condition is satisfied different from each other.