Imaging device, and focus-confirmation display method

An imaging device comprising:

• an image generation device configured to generate a first image for display on the basis of an image outputted from an imaging element provided with first and second pixel groups on which subject light beams passing through first and second regions in a photographic lens are incident, respectively, after pupil-split is applied to the subject light beams, and configured to generate a second image for display that is used for focus-confirmation on the basis of a first image and a second image outputted from the first and second pixel groups, respectively;
• a boundary change device configured to change a position of a boundary between the first image and the second image in the second image for display, in a direction orthogonal to the boundary;
• a selection device configured to select any one of the first image and the second image for each of a plurality of divisions in the second image for display, divided by the boundary changed by the boundary change device;
• a display device;
• and
• a display control device configured to control the display device to display the first image for display, and allows the second image for display in which a position of the boundary is changed by the boundary change device that is displayed in a display area in the first image for display.