An image forming method of forming images on both sides of a recording sheet; comprising the steps of: fixing a first toner image on a first surface a recording sheet; and fixing a second toner image on a second surface of the recording sheet; wherein in two-component developer includes toner particles each containing a binder resin having a glass transition temperature Tg° C. and a colorant and carrier particles in each on which magnetic powder is dispersed in a binder resin including a phenol formaldehyde obtained by a polymerization process, and the first toner image is fixed with first heat in such a way that the surface temperature of the first surface of the recording sheet is a temperature in a range of Tg° C. or more and lower than 100° C.