Provided are an imaging device, an endoscope device, and a method for controlling an imaging device, for preventing flickering, etc., of an image acquired during a focusing operation, by performing focusing control on the basis of phase information from a phase sensor in an imaging optical system in which the focus-subject distance is changed in conjunction with a change in angle of view. The imaging device comprises an imaging optical system including a movable lens (240) for adjusting the angle of view and the focus-subject distance simultaneously, an imaging element (260), a plurality of phase sensors, an acquiring unit (A/D converter (320)) for acquiring phase information from the plurality of phase sensors, a lens controller (360) for controlling the position of the movable lens (240), and a movement amount calculation unit (350) for calculating, on the basis of the phase difference based on the phase information, the amount of movement of the movable lens (240) that is needed in order to achieve a focused state of an image on the imaging element by light rays that pass through the imaging optical system, the lens controller (360) controlling the position of the movable lens (240) on the basis of the movement amount calculated by the movement amount calculation unit (350).La présente invention porte sur un dispositif dimagerie, un dispositif dendoscope et un procédé de commande de dispositif dimagerie, pour empêcher un papillotement, etc. dune image acquise durant une opération de mise au point, par réalisation dune commande de mise au point sur la base dinformations de phase en provenance dun capteur de phase dans un système optique dimagerie dans lequel la distance foyer-sujet est changée conjointement avec un changement dangle de vue. Le dispositif dimagerie comprend un système optique dimagerie comprenant une lentille mobile (240) pour ajuster langle de vue et la distance foyer-sujet de manière simultanée, un élément dimagerie (260), une pluralité de capteu
