The fixing apparatus includes a cylindrical film, a nip member in contact with a film inner surface, wherein the nip member extends in a film longitudinal direction; a heater provided in a film hollow portion, a roller forming a nip portion where the recording material is conveyed and heated to fix the image on the recording material; a support member supporting the nip member, wherein a cross section of the support member perpendicular to the film longitudinal direction has a U-shape, and two end portions forming an opening portion in the U-shape support the nip member, an insulation member provided between the two end portions and the nip plate, and a reflection member surrounding the heater between the nip member and the support member, wherein the reflection member reflects the radiation heat of the heater toward the nip member.