A toner supply container is detachably mountable to an image forming apparatus and includes: a container body for accommodating toner; an opening, formed in the container body, for permitting the supply of the toner into the image forming apparatus; and a driving-force receiving member for receiving a driving-force from a driving-force applying member provided in the main assembly. The driving-force receiving member includes an elastic press-fitting engagement member which is engageable with an elastic press-fitting engagement member provided in the main assembly. A part of one of the elastic press-fitting engagement members which is an elastic member is elastically restorable to establish driving-force transmitting engagement between the two engagement members.

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