A fuel consumption display apparatus for a mobile crane, which is in a crane operable mode or in a running mode, the mobile crane being in the operable mode when a power take-off apparatus, which takes off power for driving a hydraulic pump for the crane from an engine, is turned on, wherein fuel consumption indicates an amount of fuel consumed per unit time by the mobile crane, the fuel consumption display apparatus comprising: measuring means for measuring standby accumulated fuel consumption and standby duration in a standby state during the crane operable mode and instantaneous fuel consumption and average fuel consumption in a crane operational state during the crane operable mode, wherein the measuring means comprises: standby state determining means for determining whether or not the crane is in the standby state during the crane operable mode based on the crane is in a no-operation state; fuel consumption detecting means for detecting fuel consumption which indicates an amount of fuel consumed per unit time by the crane; instantaneous fuel consumption calculating means for calculating the instantaneous fuel consumption by multiplying the fuel consumption by a predetermined coefficient; and average fuel consumption calculating means for calculating the average fuel consumption from an operational time and accumulated fuel consumption by measuring the operational time, namely a time period from the crane turning into the operational state up to the present, and by accumulating the fuel consumption after the crane turning into the operational state for calculating the accumulated fuel consumption; and a monitor for displaying the standby accumulated fuel consumption and the standby duration measured by the measuring means and the instantaneous fuel consumption and the average fuel consumption, wherein the monitor comprises: monitor control means for displaying, on the monitor, the instantaneous fuel consumption input from the instantaneous fuel consumption calculating means and the average fuel consumption input from the average fuel consumption calculating means. measuring means for measuring standby accumulated fuel consumption and standby duration in a standby state during the crane operable mode and instantaneous fuel consumption and average fuel consumption in a crane operational state during the crane operable mode, wherein the measuring means comprises: standby state determining means for determining whether or not the crane is in the standby state during the crane operable mode based on the crane is in a no-operation state; fuel consumption detecting means for detecting fuel consumption which indicates an amount of fuel consumed per unit time by the crane; instantaneous fuel consumption calculating means for calculating the instantaneous fuel consumption by multiplying the fuel consumption by a predetermined coefficient; and average fuel consumption calculating means for calculating the average fuel consumption from an operational time and accumulated fuel consumption by measuring the operational time, namely a time period from the crane turning into the operational state up to the present, and by accumulating the fuel consumption after the crane turning into the operational state for calculating the accumulated fuel consumption; and standby state determining means for determining whether or not the crane is in the standby state during the crane operable mode based on the crane is in a no-operation state; fuel consumption detecting means for detecting fuel consumption which indicates an amount of fuel consumed per unit time by the crane; instantaneous fuel consumption calculating means for calculating the instantaneous fuel consumption by multiplying the fuel consumption by a predetermined coefficient; and average fuel consumption calculating means for calculating the average fuel consumption from an operational time and accumulated fuel consumption by measuring the operational time, namely a time period from the crane turning into the operational state up to the present, and by accumulating the fuel consumption after the crane turning into the operational state for calculating the accumulated fuel consumption; and a monitor for displaying the standby accumulated fuel consumption and the standby duration measured by the measuring means and the instantaneous fuel consumption and the average fuel consumption, wherein the monitor comprises: monitor control means for displaying, on the monitor, the instantaneous fuel consumption input from the instantaneous fuel consumption calculating means and the average fuel consumption input from the average fuel consumption calculating means.