FIXING DEVICE

Disclosed is a fixing device where a copying medium carrying a non-fixed toner image thereon is passed between a pair of fixing rolls as being kept in direct contact with each other under pressure so as to fix the non-fixed toner image on the copying medium, the device being characterized in that a toner release at least containing, as an active ingredient, a functional group-containing organopolysiloxane of a general formula (I): (I) the organopolysiloxane having a viscosity of from 10 to 100,000 cs at 25 DEG C., is supplied to at least the fixing roll of being brought into contact with the non-fixed toner image of the said pair of fixing rolls. Using the toner release, the copying medium releasability from the fixing roll to which the toner release is applied is good and the heat-resistance of the fixing roll is also good.