PURPOSE: To provide a fixing device from the container of which overflow of parting agent is not generated even by suffering movement or vibration when fixing is not performed.

CONSTITUTION: In a fixing device provided with a pair of rollers having a fixing roller 1 heated by a heating source and a pressing roller 2 pressed against the fixing roller 1 and rotated, a spreading roller 3 to spread parting agent S for preventing toner offset on at least one roller of the pair of rollers 1, 2, and a parting agent supply device to receive the parting agent S and supply the parting agent to the spreading roller 3, the vessel 11 of the parting agent spreading device is provided with an opening part 14, and also the opening edge of the opening part 14 is set detachable and movable against the spreading roller 3 or the one-side roller 1, and connected to a drive device 17 to move the vessel 11.