An image forming apparatus is provided with an apparatus main body including a developing device, and a toner container detachably mountable into the apparatus main body and adapted to replenish the developing device with toner particles. The toner container has grippable recesses, into which fingers are insertable, formed at the opposite side portions of a surface thereof facing in a withdrawing direction from the apparatus main body. A projection sloped downward along the withdrawing direction is preferably provided on a surface of each grippable recess to be gripped by the finger.