A power consumption display unit for a machine tool that is configured to machine a workpiece according to a machining program, wherein the machine tool includes: a first power-consuming element that is configured to consume power in the machining state where the machining program is executed to machine the workpiece; a second power-consuming element that is configured to consume power, when the machine tool is in the non-machining state, in order to keep the machine tool in an operation standby mode where the machining program is ready to be executed upon issuance of a command to execute the machining program; and a third power-consuming element that is configured to consume power, when the machine tool is in the non-machining state, independently of execution of the machining program, said power consumption display unit comprising: machining state determining means for determining, when a main power switch used to supply power to the machine tool is ON, whether the machine tool is in a machining state where the machining program is executed to machine the workpiece or in a non-machining state where the machining program is not executed; power consumption measuring means (15, 16, 17) for measuring a power consumption of the machine tool during a period where the machine tool is determined to be in the non-machining state by the machining state determining means; and display means for displaying the power consumption measured by the power consumption measuring means, wherein the machining state determining means is configured to determine, when the machine tool is in the non-machining state, whether the machine tool is in the operation standby mode where the first power-consuming element does not consume power and the second power-consuming element consumes power, or in an operation standby OFF mode where the first and second power-consuming elements do not consume power and the third power-consuming element consumes power; and wherein the power consumption measuring means (15, 16, 17) is configured to measure at least one of a power consumption in the operation standby mode and a power consumption in the operation standby OFF mode. machining state determining means for determining, when a main power switch used to supply power to the machine tool is ON, whether the machine tool is in a machining state where the machining program is executed to machine the workpiece or in a non-machining state where the machining program is not executed; power consumption measuring means (15, 16, 17) for measuring a power consumption of the machine tool during a period where the machine tool is determined to be in the non-machining state by the machining state determining means; and display means for displaying the power consumption measured by the power consumption measuring means, wherein the machining state determining means is configured to determine, when the machine tool is in the non-machining state, whether the machine tool is in the operation standby mode where the first power-consuming element does not consume power and the second power-consuming element consumes power, or in an operation standby OFF mode where the first and second power-consuming elements do not consume power and the third power-consuming element consumes power; and wherein the power consumption measuring means (15, 16, 17) is configured to measure at least one of a power consumption in the operation standby mode and a power consumption in the operation standby OFF mode.