To effectively provide a driver with information relating to the drive state of a vehicle by changing the display form of the speed of the vehicle based on information other than the speed.

A display device 20 mounted on a vehicle comprises: a display panel 3 for displaying vehicle speed; and a control section 21 for changing the display form of speed on the display panel 3 based on acceleration information, when the acceleration information indicating acceleration applied to the vehicle sideways to the advance direction of the vehicle is inputted.