In a fixing device, on a receiving surface of a separating plate provided at a downstream side of a nip part formed between the fixing roller and the pressing roller, a catch part is formed in an edge part facing the nip part. When a direction of a sheet ejected from the nip part comes close to the fixing roller, a front end part of the sheet is caught by the catch part, and the sheet is largely bent or leaps up. A position detector detects the bending or leaping up of the sheet and recognizes that the direction of the sheet ejected from the nip part comes close to the fixing roller. The controller decreases force for pressing the fixing roller and the pressing roller or a fixing temperature, whereby the direction of the sheet ejected from the nip part is deviated from the fixing roller.