To lessen a load stress to a lens mount part by notifying the load stress exerted on the lens mount by use of a distortion sensor.

A lens interchangeable imaging device comprises: a lens mount ring housing that mounts and holds an interchangeable lens; a distortion detection means that detects a three-dimensional displacement on the basis of a detection result of a distortion sensor sensing a distortion generated in accordance with the load stress exerted on an interior part of the housing; and a notification means that, when a distortion value calculated by the distortion detection means exceeds over a predetermined threshold value, notifies a user.