To greatly reduce necessary drawing quantity in putting paper in/out without affecting the structure of the whole device in a supply paper cassette drawable from a main body of an image forming device.

An outer panel 30 is supported by a base body part 10 of a supply paper cassette 1 by a support shaft 31 at a lower part, so that it is rotatable around the support shaft 31 in a vertical plane. With this rotation action, the outer panel 30 is capable of taking both attitudes of storage and development to an outer surface 101 of the main body 100 of the image forming device. The outer panel 30 composes part of the outer surface 101 of the main body 100 of the image forming device when it is in the storage attitude, with a front surface 32 of it level to the outer surface 101. When the outer panel 30 is in the development attitude, paper P stacked on a lift plate 11 can be reached by hand. The outer panel 30 thus makes it possible to put paper P into/out of the supply paper cassette 1 when it is in the developed attitude.