To expand an area which can be used for a control unit of a front surface of a main body portion, and to expand an exposed surface of the front surface of the main body portion while suppressing changes of a display portion to the minimum.

The display device and the on-vehicle display device comprise the main body portion having the control unit on the front surface, and the display portion 100 capable of exposing the control unit by changing that from the front surface of the main body portion. When the control unit is exposed, thickness T21 from a display screen 102 to a back surface 411 on a first end side of the display portion 100 approaching the main body portion is thinner than thickness T22 from the display screen 102 to the back surface on a second end side.

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