A sealing member for sealing a toner discharge opening of a toner accommodating
container detachably mountable to an image forming apparatus, the sealing member
includes a locking portion for being locked with a portion to be locked provided
in the image forming apparatus, the locking portion being adapted to displace with
a relative closing movement relative to the portion to be locked, wherein the toner
discharging opening is brought into an open state from a closed state by relative
to movement of the sealing member relative to the toner accommodating container
with the locking portion being in engagement with the portion to be locked; and
a releasing force receiving portion for receiving from the image forming apparatus
a releasing force for releasing engagement between the locking portion and the
portion to be locked by displacing the locking portion.
