An image-capturing apparatus comprising: an image-capturing unit capable of detachably attaching an adapter having an all-around image-capturing optical system for capturing an image of a subject all around the image-capturing apparatus, the image-capturing unit having an image-capturing optical system being for capturing a subject in one direction, and an image-capturing device for capturing a subject image incident from the image-capturing optical system; a display unit for displaying a captured image that is output from the image-capturing device, wherein: at least one of the display unit and the image-capturing unit being arranged so as to be able to rotate with respect to an axis in the main body unit of the image-capturing apparatus; a rotation detection unit for detecting a rotated state of the display unit or the image-capturing unit with respect to the main body unit, an attachment detection unit for detecting whether or not the adapter is attached to the image-capturing unit; and a control unit for controlling settings of the image-capturing apparatus in accordance with a characteristic of the all-around image-capturing optical system when the adapter is attached to the image-capturing unit, the control unit having a reverse display function for reversing and displaying the captured image on the display unit on the basis of the rotated state detected by the rotation detection unit, in the case an image-capturing direction of the image-capturing unit and the display screen of the display unit are oriented in the same direction, the control unit being arranged to, when the adapter is attached to the image-capturing unit, disable the reverse display function. an image-capturing unit capable of detachably attaching an adapter having an all-around image-capturing optical system for capturing an image of a subject all around the image-capturing apparatus, the image-capturing unit having an image-capturing optical system being for capturing a subject in one direction, and an image-capturing device for capturing a subject image incident from the image-capturing optical system; a display unit for displaying a captured image that is output from the image-capturing device, wherein: at least one of the display unit and the image-capturing unit being arranged so as to be able to rotate with respect to an axis in the main body unit of the image-capturing apparatus; a rotation detection unit for detecting a rotated state of the display unit or the image-capturing unit with respect to the main body unit, an attachment detection unit for detecting whether or not the adapter is attached to the image-capturing unit; and a control unit for controlling settings of the image-capturing apparatus in accordance with a characteristic of the all-around image-capturing optical system when the adapter is attached to the image-capturing unit, at least one of the display unit and the image-capturing unit being arranged so as to be able to rotate with respect to an axis in the main body unit of the image-capturing apparatus; a rotation detection unit for detecting a rotated state of the display unit or the image-capturing unit with respect to the main body unit, an attachment detection unit for detecting whether or not the adapter is attached to the image-capturing unit; and a control unit for controlling settings of the image-capturing apparatus in accordance with a characteristic of the all-around image-capturing optical system when the adapter is attached to the image-capturing unit, the control unit having a reverse display function for reversing and displaying the captured image on the display unit on the basis of the rotated state detected by the rotation detection unit, in the case an image-capturing direction of the image-capturing unit and the display screen of the display unit are oriented in the same direction, the control unit being arranged to, when the adapter is attached to the image-capturing unit, disable the reverse display function.