A fixing device for fixing an image on a recording medium includes a rotatable endless fixing rotary member, a heating source which heats the fixing rotary member, an opposite rotary member in contact with the fixing rotary member, a nip forming member provided inside the fixing rotary member and in contact with the opposite rotary member via the fixing rotary member to form a nip portion to which the recording medium is fed, holding members rotatably holding end portions of the fixing rotary member, and protecting members provided between the holding members and end surfaces of the fixing rotary member to protect the end portions. Each of the protecting members has an opposite surface facing the corresponding end surface of the fixing rotary member, and including an inner diameter-side end edge having an inclined surface inclined in an inner diameter direction and away from the fixing rotary member.