A digital camera includes an imaging element having an imaging surface where pixels are arranged in two dimensions in a row direction X and in a column direction Y, an AF processing unit that determines whether a focus lens is in a focused state using detection signals obtained from respective pixels of a first pixel group including plural pixels arranged in the row direction X and a second pixel group including pixels arranged at the same distance in one direction that crosses the row direction X with respect to each of the plural pixels of the first pixel group, in a state where the focus lens is at an arbitrary position, and a system control unit that moves the focus lens until the AF processing unit determines that the focus lens is in the focused state.