An image capturing apparatus on which an accessory (200, 400, 500) including a first mount is mountable by rotating relatively a plurality of first claws of the accessory (200, 400, 500) and a plurality of second claws of the image capturing apparatus, comprising a second mount configured to allow coupling to the first mount of the accessory, wherein the second mount includes a plurality of terminals disposed in a circumferential direction of the second mount and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals, each of the plurality of terminals is electrically connectable to a corresponding one of a plurality of terminals disposed in a circumferential direction of the first mount in the accessory, the terminal holder has a height level difference in a center-axis direction of the second mount, the plurality of terminals 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 (200, 400, 500) from the image capturing apparatus in a state where the accessory (200, 400, 500) 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 configured to allow coupling to the first mount of the accessory, wherein the second mount includes a plurality of terminals disposed in a circumferential direction of the second mount and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals, a plurality of terminals disposed in a circumferential direction of the second mount and configured to be used in electrical connection, and a terminal holder configured to hold the plurality of terminals, each of the plurality of terminals is electrically connectable to a corresponding one of a plurality of terminals disposed in a circumferential direction of the first mount in the accessory, the terminal holder has a height level difference in a center-axis direction of the second mount, the plurality of terminals 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 (200, 400, 500) from the image capturing apparatus in a state where the accessory (200, 400, 500) 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.