A camera includes an imaging element that receives transmitted light of an imaging optical system, a calculator that calculates focus evaluation value responding to a focus status of the focus lens based upon an output of the imaging element, a scan driving that scans the focus lens in a single direction along an optical axis, a detector that detects an absolute position of the focus lens, a pitch determiner that determines a lens movement pitch deciding timing to obtain the focus evaluation value at a given interval in response to an output of the detector during the scan driving, a controller that obtains the focus evaluation value every time the focus lens moves by the determined lens movement pitch during the scan driving and a focusing adjuster that seeks a focus point by evaluating focus evaluation values obtained by the controller and drives the focus lens to the focus point.