PROBLEM TO BE SOLVED: To enable confirmation of a plurality of items required for saving activity for a resource usage display to be easily carried out by a fewer number of times for operation at a resource usage display device for selecting any one of a plurality of selection items through operation at an operating part such as a switch and the like and displaying its value on a screen.SOLUTION: There are provided a control part for selecting any one of a plurality of selection items including a resource usage of yesterday, a target resource of yesterday and a resource usage of today; and a display 2 for displaying a value of the selected item selected by the control part. The control part comprises: an UP-DOWN switch 31 for changing over from the selected state of the resource usage of yesterday to the selected state of the target resource usage of yesterday; and a TODAY/YESTERDAY changing over switch 33 for changing over from the selected state of the resource usage of yesterday to the selected state of th
