A fusing device of an image forming apparatus, comprising: a fusing unit having a heating roller and a pressure roller which contact each other and are operable to rotate together; a cover to access the fusing unit, which is operable to be pushed closed when pressure is applied thereto; and a lever unit disposed between the fusing unit and the cover, comprising: a first rotational shaft, a first lever rotatably attached at one end to the first rotational shaft and having a first pressured part which is operable to receive the pressure from the cover and a first pressuring part on the same side of the first rotational shaft as the first pressured part wherein the first pressuring part is operable to transmit and amplify the pressure by moving a shorter rotational distance than a rotational distance moved by the pressured part, a second rotational shaft, and a second lever rotatably attached at one end to the second rotational shaft and having a second pressured part which is operable to receive the amplified pressure from the first pressuring part and a second pressuring part which is operable to transmit and re-amplify the amplified pressure to the pressure roller in a direction towards the heating roller by moving a shorter rotational distance than a rotational distance moved by the second pressured part. a fusing unit having a heating roller and a pressure roller which contact each other and are operable to rotate together; a cover to access the fusing unit, which is operable to be pushed closed when pressure is applied thereto; and a lever unit disposed between the fusing unit and the cover, comprising: a first rotational shaft, a first lever rotatably attached at one end to the first rotational shaft and having a first pressured part which is operable to receive the pressure from the cover and a first pressuring part on the same side of the first rotational shaft as the first pressured part wherein the first pressuring part is operable to transmit and amplify the pressure by moving a shorter rotational distance than a rotational distance moved by the pressured part, a second rotational shaft, and a second lever rotatably attached at one end to the second rotational shaft and having a second pressured part which is operable to receive the amplified pressure from the first pressuring part and a second pressuring part which is operable to transmit and re-amplify the amplified pressure to the pressure roller in a direction towards the heating roller by moving a shorter rotational distance than a rotational distance moved by the second pressured part. a first rotational shaft, a first lever rotatably attached at one end to the first rotational shaft and having a first pressured part which is operable to receive the pressure from the cover and a first pressuring part on the same side of the first rotational shaft as the first pressured part wherein the first pressuring part is operable to transmit and amplify the pressure by moving a shorter rotational distance than a rotational distance moved by the pressured part, a second rotational shaft, and a second lever rotatably attached at one end to the second rotational shaft and having a second pressured part which is operable to receive the amplified pressure from the first pressuring part and a second pressuring part which is operable to transmit and re-amplify the amplified pressure to the pressure roller in a direction towards the heating roller by moving a shorter rotational distance than a rotational distance moved by the second pressured part.