A door unlocking device of a construction machine, the door unlocking device comprising: a locking device configured to lock a door of a cab of the construction machine; an outer handle configured to receive an operation for unlocking the locking device from outside of the cab; and an inner handle configured to receive an operation for unlocking the locking device from inside of the cab, wherein the locking device includes: a locking part configured to lock the door; an unlocking lever configured to be pivoted about an unlocking lever pivoting shaft and unlock the locking part when pivoted at a predetermined angle; a link rod connecting the outer handle to the unlocking lever; and an abutted part provided on the unlocking lever; the inner handle includes: an operation arm part pivotable about an inner handle pivoting shaft provided in the door; and a pushing plate provided away from the inner handle pivoting shaft, the pushing plate being configured to push the abutted part to pivot the unlocking lever in an identical direction to the inner handle, and the outer handle is configured to perform an unlocking operation on the locking part without pivoting the inner handle, by pulling the link rod and pivoting the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle as the outer handle receives an operation for unlocking the locking device, wherein when the inner handle receives the operation for unlocking the locking device, the pushing plate pushes down the abutted part to pivot the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle, and when the outer handle receives the operation for unlocking the locking device, the link rod pulls down the unlocking lever to pivot the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle, characterized in that the locking device further includes a rod connecting plate provided on the unlocking lever and connected to the link rod connected to the outer handle, and a central position of the inner handle pivoting shaft is above a central position of the unlocking lever pivoting shaft. a locking device configured to lock a door of a cab of the construction machine; an outer handle configured to receive an operation for unlocking the locking device from outside of the cab; and an inner handle configured to receive an operation for unlocking the locking device from inside of the cab, wherein the locking device includes: a locking part configured to lock the door; an unlocking lever configured to be pivoted about an unlocking lever pivoting shaft and unlock the locking part when pivoted at a predetermined angle; a link rod connecting the outer handle to the unlocking lever; and an abutted part provided on the unlocking lever; a locking part configured to lock the door; an unlocking lever configured to be pivoted about an unlocking lever pivoting shaft and unlock the locking part when pivoted at a predetermined angle; a link rod connecting the outer handle to the unlocking lever; and an abutted part provided on the unlocking lever; the inner handle includes: an operation arm part pivotable about an inner handle pivoting shaft provided in the door; and a pushing plate provided away from the inner handle pivoting shaft, the pushing plate being configured to push the abutted part to pivot the unlocking lever in an identical direction to the inner handle, and an operation arm part pivotable about an inner handle pivoting shaft provided in the door; and a pushing plate provided away from the inner handle pivoting shaft, the pushing plate being configured to push the abutted part to pivot the unlocking lever in an identical direction to the inner handle, and the outer handle is configured to perform an unlocking operation on the locking part without pivoting the inner handle, by pulling the link rod and pivoting the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle as the outer handle receives an operation for unlocking the locking device, wherein when the inner handle receives the operation for unlocking the locking device, the pushing plate pushes down the abutted part to pivot the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle, and when the outer handle receives the operation for unlocking the locking device, the link rod pulls down the unlocking lever to pivot the unlocking lever about the unlocking lever pivoting shaft to the predetermined angle, characterized in that the locking device further includes a rod connecting plate provided on the unlocking lever and connected to the link rod connected to the outer handle, and a central position of the inner handle pivoting shaft is above a central position of the unlocking lever pivoting shaft.