Patent ID: 8165500

Claim:
A fixing device comprising: a belt unit that includes: a first roller member; a second roller member provided above the first roller member; a belt member rotating while being laid around the first roller member and the second roller member; and a positioning member rotatably holding the first roller member and being used for positioning of the first roller member; a pressure member that is provided below the first roller member and comes into pressure-contact with an outer peripheral surface of the belt member at a position where the pressure member faces the first roller member, thereby to form a fixing pressure portion between the pressure member and the belt member, the fixing pressure portion allowing a recording medium carrying an unfixed toner image to pass therethrough; a first housing that includes a concave portion and a sloping portion formed therein and supports the positioning member, the concave portion opening toward a lateral direction, the sloping portion sloping downward from an edge portion of a lower side of the concave portion; and a second housing that presses the positioning member so that the positioning member is fitted into the concave portion, in accordance with a closing operation to move in a direction in which the second housing is closed with respect to the first housing.