Camera accessory capable of being attached to or detached from image pickup apparatus main body

A camera accessory capable of being attached to or detached from an image pickup apparatus main body including an image pickup plane and a camera accessory attachment portion, the camera accessory comprising:

• a first connecting terminal configured to perform at least one input or output of video signals, operating power, and control signals with respect to the image pickup apparatus main body;
• and
• a second connecting terminal configured to perform at least one input or output of the video signals, the operating power, and the control signals with respect to the outside of the camera accessory,
• wherein, in a state, in which the camera accessory is attached to the camera accessory attachment portion, an expansion module attachment portion for attaching an expansion module and an operation portion are arranged to be substantially parallel to the image pickup plane and are arranged on a surface opposite to the image pickup plane of the image pickup apparatus main body,
• wherein the operation portion includes a plurality of operation switches, and
• an attachment/detachment knob provided on the expansion module attachment portion and the plurality of operation switches of the operation portion are arranged so as not to overlap each other in projection in an optical axis direction of the image pickup apparatus main body.