The invention makes adjustable the focus to a subject at an infinite-distance with high precision. An AF part 10 of an electronic camera is equipped with two filter means for normal position detectionand infinite-distance position detection in which more high-frequency components than those of the normal position detection are passed. When an infinite-distance detection button is pressed, movement of a focusing lens 3 by an amount of movement smaller than the amount of movement of AF processing of normal photographic processing and imaging are repeated within a focus position proximity rangecorresponding to an infinite distance, the filter means for the infinite-distance position detection performs filter processing for an imaging signal obtained by the imaging, and focus detection is carried out on the basis of the contrast value of the obtained imaging signal to solve the above problem.