A developer supply container is detachably mountable to an image forming apparatus. The the developer supply container includes: a container body for containing a developer; a discharge opening for permitting discharge of the developer from an inside of the container body; a plate-like member having a feeding portion for feeding the developer in the container body toward the discharge opening with rotation of the container body; a pair of nipping portions, provided on an inner surface at one longitudinal end of the container body, for nipping the plate-like member inserted from the other longitudinal end of the container body; and a guide portion, provided between the nipping portions, for guiding insertion of the plate-like member.