A fixing device includes: a unit that includes a fixing member and a pressure member contacting the fixing member to form a nip, and heats a medium with a toner image while conveying it with it nipped in the nip, fixing the toner image; a separating member that separates the medium from the fixing member; and a holder holding the separating member. The separating member includes: a separating guide portion that is disposed downstream of the nip in a conveying direction of the medium and faces the fixing member along a width direction of the fixing member, extends along the conveying direction, and separates the medium from the fixing member; and an extending portion that extends from a downstream edge in the conveying direction of the separating guide portion, and is bent with respect to the separating guide portion to separate from the medium downstream in the conveying direction.