an image recording carrier includes : an image recording plate including a plate - shaped supporter , and a recording layer which is superposed on the top of the supporter , and which accumulates and recodes a radiograph when irradiated with radioactive rays carrying an image ; and a cassette in which the image recording plate is housed . multiple steps are formed in the direction along the thickness of the image recording plate on at least one side surface of the image recording plate , and a front portion which is one of the multiple steps including the recording layer , protrudes from the rest of the multiple steps . a facing surface of the cassette facing the side surface of the image recording plate while the image recording plate is housed in the cassette has an opposed portion which is opposed to the front portion , and which dents from the rest of the multiple steps .