Patent ID: 8831494

Claim:
A fixing device comprising: a metal member that is substantially cylindrical; a heater positioned to heat the metal member; a fixing member that is endless and flexible, and disposed rotatably around the metal member, an inner circumferential surface of the fixing member being heated by the metal member to heat and fix a toner image; a rotary pressing member disposed opposite the metal member and pressed against an outer circumferential surface of the fixing member to form a nip between the rotary pressing member and the fixing member through which a recording medium bearing the toner image passes; and a stationary member disposed at an inner circumferential surface side of the fixing member and pressed by the rotary pressing member via the fixing member to form the nip, wherein, at least when the fixing member is relatively moved toward the metal member during assembly of the fixing member with the metal member, the metal member includes at least one protruding portion having a length less than a length of an axial end of the metal member in a rotation direction of the fixing member around the metal member, and the at least one protruding portion protrudes axially outward from the axial end of the metal member to guide the fixing member axially toward the metal member.