An automatic focusing device includes an extracting circuit which extracts
a focus signal corresponding to a degree of focus from a picked-up image
signal, a focusing lens and a direction deciding circuit which decides the
direction of driving the focusing lens on the basis of the output of the
extraction circuit when the state of focus deviates from an in-focus
state. The extracting circuit is arranged to simultaneously extract a
plurality of focus signals having different frequency components from each
other. The direction deciding circuit is arranged to perform computing
operations on the focus signals separately from each other with respect to
the focusing lens driving direction and to decide the focusing lens
driving direction when the results of the computing operations come to
coincide with each other.
