A tubular fuser device rotates and is in contact with a sheet on which a positively charged toner image is formed to fix the toner image to the sheet. The fuser device includes a tubular substrate made of a metal, a rubber layer covering the outer periphery of the substrate, an adhesion layer covering the outer periphery of the rubber layer, and a surface layer made of a resin covering the outer periphery of the adhesion layer. In the fuser device, C·R/A2 is less than 1.1×10−53 FΩ/cm4 in which C·R/A2 is a product of an electrostatic capacity per unit area C/A in a thickness direction of the fuser device and an electrical resistance per unit area R/A in the thickness direction of the fuser device.