Provided are a focus control device, a lens device, an imaging device, a focus control method, and a focus control program that can improve the accuracy of focus control by calculating a phase difference suitable for a subject. The system control unit 11 performs an addition correlation calculation unit 11A that performs a correlation calculation between the first signal group obtained by the vertical addition and the second signal group, and a non-operation that performs a correlation calculation of the detection signal group before the vertical addition. The degree of coincidence between the first result information of the correlation calculation by the addition correlation calculation unit 11B and the correlation calculation by the non-addition correlation calculation unit 11B is calculated, and based on the degree of coincidence A selection unit 11C that selects either the first result information or the second result information, and a lens driving unit 11E that drives the focus lens based on the result information selected by the selection unit 11C are provided.
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