Fixing device

A fixing device configured to thermally fix a developing agent image to a sheet fed in a sheet feeding direction, the fixing device comprising;

• a tubular flexible fusing member having an inner peripheral surface defining an internal space and configured to be circularly movable;
• a heater disposed in the internal space and configured to radiate a radiant heat;
• a nip member disposed in the internal space, the inner peripheral surface configured to be in sliding contact with the nip member;
• a reflection member configured to reflect the radiant heat from the heater toward the nip member, the reflection member including a reflection portion and an extending portion;
• a stay configured to cover the reflection portion and to support the nip member, the extending portion extending outside of the stay;
• and
• a backup member configured to provide a nip region in cooperation with the nip member upon nipping the tubular flexible fusing member between the backup member and the nip member,
• wherein the extending portion extends between the nip member and the stay,
• wherein the sheet has a width in a widthwise direction perpendicular to the sheet feeding direction, and
• wherein the extending portion has an edge portion extending in the widthwise direction, the edge portion being provided with a comb-like portion.