A focus adjusting method for adjusting focus by moving a focusing lens group of a photographing optical system, wherein the focus adjusting method includes a first search stage at which a focus search operation is performed based on an image formed in a large focus area while the focusing lens group is moved stepwise over an entire range of movement thereof from the near extremity to the far extremity, and a second search stage at which the focus search operation is performed, based on images formed in small focus areas, at front and rear close vicinities of the in-focus position while the focusing lens group is moved stepwise over a portion of the entire range of movement thereof.