An image forming apparatus for forming an image on a sheet including: a housing; a cassette detachably accommodated in the housing and configured to store the sheet; a feeding unit configured to feed the sheet; and an image forming unit configured to form the image on the sheet fed by the feeding unit, wherein the cassette includes: a first wall along the trailing edge, a second wall along the leading edge, a first bottom plate extending from the first wall toward the second wall, a second bottom plate extending from the second wall toward the first wall, and a connecting member configured to set a first state where the first and second bottom plates are connected and a second state where the first and second bottom plates are disconnected, and the first and second bottom plates in the second state are independently withdrawable from the housing.