A developing agent container includes a housing having a feeding element that
feeds
a developing agent and a sealing element made of felt of polyester-base fibers
to prevent toner leakage from both ends of a developing roller with respect to
an axial direction when mounted in position. The sealing element may be made of
a fabric formed with weaving seams. Assembling of the developing agent container
includes placing the sealing element at an end of the inside of the housing and
placing the feeding element on the sealing element in a direction that the feeding
element feeds the developing agent.
