A fixing device includes a feeding roller for feeding a belt-shaped
cleaning member which has been rolled up, and a winding roller for taking
up the cleaning member which has been fed from the feeding roller and
cleaned the surface of the fixing roller. Each of the feeding roller and
the winding roller rotates by a time control of a control portion so that
a sum of a feed amount of the cleaning member which is fed by the feeding
roller at one feeding occasion, and a take-up amount of the cleaning
member which is taken up by the winding roller at one take-up occasion,
is equal to or more than a double of a length Ln of a nip section.