An engine device comprising: a first turbocharger; a second turbocharger; and the first turbocharger and the second turbocharger being arranged in series in an exhaust gas discharge channel of an engine, wherein the first turbocharger and the second turbocharger are arranged in one side surface of the engine, the second turbocharger is arranged so as to be close to the one side surface of the engine, and the first turbocharger is arranged so as to be away from the one side surface of the engine, wherein the engine device further comprises an intercooler which lowers a supply air temperature of the first turbocharger and the second turbocharger, wherein a vertical portion of a turbocharger unit frame is bonded and fixed to the one side surface of the engine, and the intercooler is attached to a lower surface side of a horizontal portion of the turbocharger unit frame, and the first turbocharger and the second turbocharger are attached to a top surface side of the horizontal portion of the turbocharger unit frame, wherein the engine device further comprises an exhaust pipe which derives exhaust gas of the engine to the first turbocharger, wherein one end portion of the horizontal portion of the turbocharger unit frame is connected in an L-shaped manner to an upper end side of the vertical portion of the turbocharger unit frame, characterized in that a cradle frame is firmly fixed to the top surface side of the horizontal portion of the turbocharger unit frame to which the vertical portion of the turbocharger unit frame is connected, the second turbocharger is mounted on the cradle frame, and the exhaust pipe is extended between the horizontal portion of the turbocharger unit frame and the cradle frame. a first turbocharger; a second turbocharger; and the first turbocharger and the second turbocharger being arranged in series in an exhaust gas discharge channel of an engine, wherein the first turbocharger and the second turbocharger are arranged in one side surface of the engine, the second turbocharger is arranged so as to be close to the one side surface of the engine, and the first turbocharger is arranged so as to be away from the one side surface of the engine, wherein the engine device further comprises an intercooler which lowers a supply air temperature of the first turbocharger and the second turbocharger, wherein a vertical portion of a turbocharger unit frame is bonded and fixed to the one side surface of the engine, and the intercooler is attached to a lower surface side of a horizontal portion of the turbocharger unit frame, and the first turbocharger and the second turbocharger are attached to a top surface side of the horizontal portion of the turbocharger unit frame, wherein the engine device further comprises an exhaust pipe which derives exhaust gas of the engine to the first turbocharger, wherein one end portion of the horizontal portion of the turbocharger unit frame is connected in an L-shaped manner to an upper end side of the vertical portion of the turbocharger unit frame, characterized in that a cradle frame is firmly fixed to the top surface side of the horizontal portion of the turbocharger unit frame to which the vertical portion of the turbocharger unit frame is connected, the second turbocharger is mounted on the cradle frame, and the exhaust pipe is extended between the horizontal portion of the turbocharger unit frame and the cradle frame.