A fixing device and An image forming apparatus include: a first pressure roller having an elastic layer in a surface layer section; a fixing belt wound on the elastic layer of the first pressure roller; a second pressure roller that presses the elastic layer of the first pressure roller via the fixing belt, the second pressure roller forming a fixing nip portion between the fixing belt and the second pressure roller; and a guide member that guides the fixing belt in such a manner as to separate the fixing belt from a protruding portion of the elastic layer, the protruding portion being formed on an entrance side of the fixing nip portion in a sheet conveying direction.