Disclosed is an adhesive for an adhesive layer of a fixing member including a substantially cylindrical substrate, an elastic layer around the substrate, a surface layer covering the elastic layer, and the adhesive layer between the elastic layer and the surface layer. The adhesive contains a dialkylpolyorganosiloxane having crosslinking groups and a dialkylpolyorganosiloxane having vinyl groups. The molar ratio of the crosslinking groups to the vinyl groups in the adhesive is about 1.1 to about 4. The invention also discloses a fixing member, a fixing device, and an image-forming apparatus.