To provide an imaging device that improves the usability for a user to the change of a function which is allocated to an operation member and related to imaging, in an imaging device that can image a subject in an imaging mode where the subject is imaged under an imaging condition that is preliminarily defined, or in a custom mode where the subject is imaged under an imaging condition that is set by the user.

In an imaging device, a changed function is set so that a function changed by a changing part in an imaging mode is effective until the function is changed next, and that a function changed by the changing part in a custom mode is effective only in the imaging in the custom mode at the point of time of the change.