A fixing device includes a fixing member, a pressuring member, a separating member and a reciprocating mechanism. The fixing member is arranged rotatably around a rotation axis. The fixing member includes a passing region and a non-passing region. Through the passing region, a recording medium passes. The non-passing region is arranged outside the passing region. The pressuring member is arranged rotatably and configured to come into pressure contact with the fixing member so as to form a fixing nip. The separating member includes a separating plate and a contact piece. The separating plate is configured to face the passing region with an interval and separate the recording medium passing through the fixing nip from the passing region. The contact piece is configured to come into contact with the non-passing region. The reciprocating mechanism is configured to reciprocate the separating member along a direction of the rotation axis.