An image capturing system that makes it possible to easily attach an accessory to an image capturing apparatus body without requiring any tool. The image capturing apparatus body is provided with an accessory shoe and a screw hole. The accessory removably attached to the image capturing apparatus body includes a sheet metal that is engaged with the accessory shoe by being slidably inserted therein, and a fixing screw that has an operation portion which is rotationally operated, and is provided, in association with the screw hole, at a location frontward of the sheet metal in a direction of inserting the sheet metal into the accessory shoe. The fixing screw is screwed into the screw hole in a state in which the sheet metal is engaged with the accessory shoe, whereby the accessory is attached to the image capturing apparatus body.