The image-capturing apparatus includes a camera communicator configured to provide, with the accessory apparatus, a first data communication channel used for transmitting accessory data from the accessory apparatus to the image-capturing apparatus, and a second data communication channel used for transmitting camera data from the image-capturing apparatus to the accessory apparatus; and a camera controller configured to perform communication with the accessory apparatus through the camera communicator. The camera controller and the accessory apparatus are configured to be capable of switching their communication modes between a first communication mode and a second communication mode. The camera controller is configured to cause the accessory apparatus to transmit the accessory data whose settings of parity bits are different between in the first and second communication modes.
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