An image coding apparatus includes a coding unit which generates coded data on a block basis, by coding the input image; a switching unit which selects and outputs either the coded data or uncompressed image data corresponding to the coded data; and a judging unit which judges, on a block basis, whether the code amount of the coded data is larger than a predetermined threshold. A control unit changes, to a predetermined specified coding type, the coding type of a first block and the coding type of a second block when the code amount of coded data generated by coding the first block is judged to be larger than the threshold, and the switching unit outputs the uncompressed image data corresponding to the coded data when the coding type of the coded data is the specified coding type.