A developer supply container demountably settable in a developer supply apparatus provided with a rotatable adaptation portion , 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 provided on a peripheral surface of said container body configured and positioned to permit or prevent, after 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 to a configuration of the adaptation portion ; and a leading portion configured to rotate the adaptation portion with the inserting operation of said developer supply container to lead the adaptation portion toward said erroneous set prevention portion irrespective of a rotational position of said erroneous set prevention portion when said developer supply container is inserted into the developer supply apparatus along an inserting direction (a) of said developer supply container , wherein the leading portion has a projection portion having an inclined surface with respect to said rotational axis direction of said developer supply container and is provided on a peripheral surface of said container body at a position downstream of said erroneous set prevention portion with respect to the inserting direction (a) of said developer supply container . 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 provided on a peripheral surface of said container body configured and positioned to permit or prevent, after 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 to a configuration of the adaptation portion ; and a leading portion configured to rotate the adaptation portion with the inserting operation of said developer supply container to lead the adaptation portion toward said erroneous set prevention portion irrespective of a rotational position of said erroneous set prevention portion when said developer supply container is inserted into the developer supply apparatus along an inserting direction (a) of said developer supply container , wherein the leading portion has a projection portion having an inclined surface with respect to said rotational axis direction of said developer supply container and is provided on a peripheral surface of said container body at a position downstream of said erroneous set prevention portion with respect to the inserting direction (a) of said developer supply container . <EOS>