Cartridge detachably attachable to image forming apparatus

A cartridge detachably mountable to a main body of an image forming apparatus, comprising:

• a developing frame;
• a developer carrying member provided in said developer frame and adapted to hold and carry developer;
• a developer containing container for containing the developer and for supplying the developer to said developer frame;
• a seal member for unsealably sealing an opening portion through which the developer is supplied from said developer containing container to said developing frame;
• a rotary member for supplying the developer toward said developer carrying member;
• first drive transmitting means for effecting drive transmission between said developer carrying member and said rotary member;
• and
• second drive transmitting means for transmitting the driving to said seal member to unseal said seal member;
• and wherein at least a part of said first drive transmitting means is provided at one end side of said developer carrying member in a longitudinal direction thereof and said second drive transmitting means is provided at the other end side of said developer carrying member in the longitudinal direction, and drive transmission between said one end side and said the other end side is effected by said developer carrying member or said rotary member.