Display Device And Construction Machine

A display device of a construction machine includes a control unit and a display unit. The display unit displays a display screen having the second display area which is a guidance display area for providing guidance on the operation contents with respect to the display device. The control unit functions as a display control unit that controls the display unit to change a display mode of the second display area according to the operation state of a cutoff lever which is a safety operation member of the construction machine.