A fluctuation detecting apparatus includes a light receiving portion for detecting
an image signal for an object in each of a plurality of areas, a judging circuit
for judging from the image signal obtained in each of the areas whether an object
located at a long distance is mixed with an object located at a short distance,
and a fluctuation amount calculating circuit for independently finding fluctuation
data by the use of the image signal of the area in which the object located at
a short distance exists and the image signal of the area in which the object located
at a long distance exists when the judging circuit judges that the object located
at a long distance is mixed with the object located at a short distance, and calculating
a rotational fluctuation amount and a shift fluctuation amount on the basis of
the fluctuation data.
