A paper feed roller of the present invention comprises a roller body 2 integrally formed of elastic material in a cylindrical shape in which a plurality of protruding lines 6 are disposed on a peripheral surface 5 at even intervals, wherein the roller body 2 is formed so that crest portions 6a and trough portions 6b are continuously provided in a circumferential direction, an opening angle is equal to or more than 2 and is equal to or less than 8, a radial height h of the protruding line is equal to or more than 0.051 mm and is equal to or less than 0.1 mm, and a curvature radius r1 at a shoulder is equal to or more than 0.55 mm.

A fixing device includes an endless belt that is heated and movable in a circulating manner, a fixing unit that is fixed in contact with an inner peripheral surface of the belt, a pressure roller that presses the belt against the fixing unit to form a fixing portion through which a recording material on which an unfixed image is formed is to pass and is rotationally driven, and a support roller that is disposed on an upstream side of the fixing unit in a moving direction of the belt and supports the belt to allow the belt to be rotatable, in which the fixing unit includes a first curved surface that is an arc-shaped curved surface formed on an upstream side of a position at which the fixing portion is formed in the moving direction and a second curved surface that is an arc-shaped curved surface formed on an upstream side of the first curved surface in the moving direction, and satisfies a condition of r1>r2 in a case where a curvature radius of the first curved surface is denoted by r1 (mm) and a curvature radius of the second curved surface is denoted by r2 (mm), and the belt is spanned over the support roller and the first curved surface in a state where tension is applied to the belt.

A fixing device includes a moving member that circularly moves, a pressure applying member that is disposed to be in contact with an outer peripheral surface of the moving member, that is used to press a recording medium on which an image is formed, that rotates as the pressure applying member receives a driving force from a drive source, and that presses the recording medium passing through a contact portion between the outer peripheral surface and the pressure applying member, a pressing member that is disposed inside the moving member, that is urged toward the pressure applying member, that is pressed against the pressure applying member with the moving member interposed therebetween, and that is provided to be movable in a direction away from the pressure applying member, and a restriction portion that restricts movement of the pressure applying member that is caused to move in a direction away from the outer peripheral surface of the moving member as the driving force is transmitted from the drive source to the pressure applying member.