A fuser device includes a fusing member including an elastic layer on a
surface side thereof and a cylindrical curved surface portion having a
predetermined diameter, a heating member including a cylindrical curved
surface portion having a predetermined diameter, the heating member
having contact with the fusing member and heating the fusing member, and
a pressure member including an elastic layer on a surface side thereof
and a cylindrical curved surface portion having a predetermined diameter,
the pressure member pressing the fusing member.