An image capturing apparatus on which an accessory including a first mount (B) is mountable by rotating relatively a plurality of first claws of the accessory and a plurality of second claws of the image capturing apparatus , comprising a second mount (A) configured to allow coupling to the first mount (B) of the accessory, wherein the second mount (A) includes a plurality of terminals (1001-1012) disposed in a circumferential direction of the second mount (A) and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals (1001-1012), each of the plurality of terminals (1001-1012) is electrically connectable to a corresponding one of a plurality of terminals (2001-2012) disposed in a circumferential direction of the first mount (B) in the accessory, the terminal holder has a height level difference in a center-axis direction of the second mount (A), the plurality of terminals (1001-1012) of the image capturing apparatus include a first terminal configured to be used to detect mounting of the accessory on the image capturing apparatus and a third terminal configured to supply communication control power, which is communication power used mainly in communication control, to the accessory from the image capturing apparatus in a state where the accessory is mounted on the image capturing apparatus , the terminal holder has at least a first stage and a second stage different from the first stage, the first terminal is disposed on the first stage and disposed further in a mount direction of the accessory than the other terminals among the plurality of terminals of the image capturing apparatus that are on the first stage of the terminal holder , and the third terminal is disposed on the second stage of the terminal holder . a second mount (A) configured to allow coupling to the first mount (B) of the accessory, wherein the second mount (A) includes a plurality of terminals (1001-1012) disposed in a circumferential direction of the second mount (A) and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals (1001-1012), a plurality of terminals (1001-1012) disposed in a circumferential direction of the second mount (A) and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals (1001-1012), each of the plurality of terminals (1001-1012) is electrically connectable to a corresponding one of a plurality of terminals (2001-2012) disposed in a circumferential direction of the first mount (B) in the accessory, the terminal holder has a height level difference in a center-axis direction of the second mount (A), the plurality of terminals (1001-1012) of the image capturing apparatus include a first terminal configured to be used to detect mounting of the accessory on the image capturing apparatus and a third terminal configured to supply communication control power, which is communication power used mainly in communication control, to the accessory from the image capturing apparatus in a state where the accessory is mounted on the image capturing apparatus , the terminal holder has at least a first stage and a second stage different from the first stage, the first terminal is disposed on the first stage and disposed further in a mount direction of the accessory than the other terminals among the plurality of terminals of the image capturing apparatus that are on the first stage of the terminal holder , and the third terminal is disposed on the second stage of the terminal holder . <EOS>