The present invention provides an image-shake correction apparatus comprising: an image displacement device that displaces on an image forming plane an image formed by an image-capturing optical system; an image-shake correction device that displaces an image by use of the image displacement device in such a way as to cancel an image shake due to a vibration exerted on the image-capturing optical system; and an output device that outputs to a predetermined external apparatus information on image displacement by the image displacement device, in order to prevent the occurrence of defects due to image-shake correction, information on the image-shake correction can be supplied to an external apparatus that obtains capturing conditions of a camera and implements predetermined processing.