A developer supply container demountably settable in a developer supply apparatus provided with a rotatable adaptation portion (400c, 9a, 9b), said developer supply container comprising: a container body including an inner space that accommodates a developer and a discharge opening for permitting discharging of the developer; a feeding portion that feeds the developer in said container body toward said discharge opening with rotation of said container body; an erroneous set prevention portion (5, 5a) configured and positioned to permit or prevent, when said developer supply container is partially inserted into the developer supply apparatus along a rotational axis direction of said developer supply container, a further inserting operation for setting said developer supply container into the developer supply apparatus depending on the correspondence of said erroneous set prevention portion (5, 5a) to a configuration of the adaptation portion (400c, 9a, 9b); and characterized by further comprising: a leading portion (8, 8a, 8b) rotatable with said erroneous set prevention portion (5, 5a) and configured to rotate the adaptation portion (400c, 9a, 9b) with the inserting operation of said developer supply container to lead said erroneous set prevention portion (5, 5a) and the adaptation portion (400c, 9a, 9b) to be opposed to each other, irrespective of a rotational position of said erroneous set prevention portion (5, 5a) when said developer supply container is inserted into the developer supply apparatus, wherein the erroneous set prevention portion (5, 5a) and the leading portions (8, 8a, 8b) are provided on a rotation member rotatable relative to said container body. a container body including an inner space that accommodates a developer and a discharge opening for permitting discharging of the developer; a feeding portion that feeds the developer in said container body toward said discharge opening with rotation of said container body; an erroneous set prevention portion (5, 5a) configured and positioned to permit or prevent, when said developer supply container is partially inserted into the developer supply apparatus along a rotational axis direction of said developer supply container, a further inserting operation for setting said developer supply container into the developer supply apparatus depending on the correspondence of said erroneous set prevention portion (5, 5a) to a configuration of the adaptation portion (400c, 9a, 9b); and characterized by further comprising: a leading portion (8, 8a, 8b) rotatable with said erroneous set prevention portion (5, 5a) and configured to rotate the adaptation portion (400c, 9a, 9b) with the inserting operation of said developer supply container to lead said erroneous set prevention portion (5, 5a) and the adaptation portion (400c, 9a, 9b) to be opposed to each other, irrespective of a rotational position of said erroneous set prevention portion (5, 5a) when said developer supply container is inserted into the developer supply apparatus, wherein the erroneous set prevention portion (5, 5a) and the leading portions (8, 8a, 8b) are provided on a rotation member rotatable relative to said container body. a leading portion (8, 8a, 8b) rotatable with said erroneous set prevention portion (5, 5a) and configured to rotate the adaptation portion (400c, 9a, 9b) with the inserting operation of said developer supply container to lead said erroneous set prevention portion (5, 5a) and the adaptation portion (400c, 9a, 9b) to be opposed to each other, irrespective of a rotational position of said erroneous set prevention portion (5, 5a) when said developer supply container is inserted into the developer supply apparatus, wherein the erroneous set prevention portion (5, 5a) and the leading portions (8, 8a, 8b) are provided on a rotation member rotatable relative to said container body.