A fixing device comprising: a fixing device main body having an opening across a back portion and an upper portion of a conveying passage of a recording sheet; and a fixing cover openably/closably covering the opening and being rotatably supported with a first axis as a rotational central axis, the first axis extending in a width direction of the recording sheet in a lower end of the back portion of the opening, wherein the fixing cover includes: a first fixing cover portion that covers the back portion of the conveying passage, a lower end portion of the first fixing cover portion being rotatably supported with the first axis as the rotational central axis; and a second fixing cover portion that covers the upper portion of the conveying passage, wherein the second fixing cover portion has a bendable structure with respect to the first fixing cover portion, wherein the first fixing cover portion includes a first fixing cover, the second fixing cover portion includes a second fixing cover, and an end portion on a first fixing cover side in the second fixing cover is rotatably installed at an end portion on a second fixing cover side in the first fixing cover with a second axis extending in the width direction as a rotational central axis; the fixing cover further includes a conveyance guide rotatably located with a third axis extending in the width direction as a rotational central axis, at an end portion on an opposite side with respect to the first fixing cover in the second fixing cover, characterized in that the fixing cover includes a roller doubling as a discharge roller and a switchback roller for inverting the back and front surface of a recording sheet. a fixing device main body having an opening across a back portion and an upper portion of a conveying passage of a recording sheet; and a fixing cover openably/closably covering the opening and being rotatably supported with a first axis as a rotational central axis, the first axis extending in a width direction of the recording sheet in a lower end of the back portion of the opening, wherein the fixing cover includes: a first fixing cover portion that covers the back portion of the conveying passage, a lower end portion of the first fixing cover portion being rotatably supported with the first axis as the rotational central axis; and a second fixing cover portion that covers the upper portion of the conveying passage, a first fixing cover portion that covers the back portion of the conveying passage, a lower end portion of the first fixing cover portion being rotatably supported with the first axis as the rotational central axis; and a second fixing cover portion that covers the upper portion of the conveying passage, wherein the second fixing cover portion has a bendable structure with respect to the first fixing cover portion, wherein the first fixing cover portion includes a first fixing cover, the second fixing cover portion includes a second fixing cover, and an end portion on a first fixing cover side in the second fixing cover is rotatably installed at an end portion on a second fixing cover side in the first fixing cover with a second axis extending in the width direction as a rotational central axis; the fixing cover further includes a conveyance guide rotatably located with a third axis extending in the width direction as a rotational central axis, at an end portion on an opposite side with respect to the first fixing cover in the second fixing cover, characterized in that the fixing cover includes a roller doubling as a discharge roller and a switchback roller for inverting the back and front surface of a recording sheet.