An image forming apparatus may include a developing device including a developing roller and a coupling rotatable both in a first direction and in a second direction opposite to the first direction, a coupler engageable with the coupling, a motor configured to drive the coupler, the motor configured to cause the coupler to be a first state in which the coupling rotates in the second direction and a second state in which the coupling rotates in the first direction, and a controller configured to transfer, to the motor, an instruction for changing the coupler to the second state, in a case where the controller judges that the remaining toner amount in a developing chamber of the developing device is smaller than or equal to the first predetermined value.