Camera device and shake correction method

A camera device which is a fixed to a fixing target surface, and is provided in a place in which shaking occurs on the fixing target surface, the camera device comprising:

• a lens on which subject light is incident;
• an imaging element that images an image based on the subject light;
• a sensor that detects shake of the camera device;
• a shake correction mechanism that holds a holder which holds the imaging element, and performs shake correction on a captured image captured by the imaging element through driving of the holder based on a detection value of the sensor;
• and
• a processor configured to perform operations including:
• calculating a current shake correction amount based on an estimated focal length of the lens;
• acquiring a disturbance shake amount based on the detection value of the sensor;
• calculating, as a residual shake amount, a difference between the disturbance shake amount and the current shake correction amount;
• determining whether the residual shake amount is a predetermined value;
• when the residual shake amount is the predetermined value, setting the estimated focal length used in the calculating of the current shake correction amount as the focal length of the lens;
• and
• when the residual shake amount is not the predetermined value, changing the estimated focal length of the lens based on the current shake correction amount, and repeating the operations.