A user interface device comprising: a transparent panel unit including a plurality of layers, each of the layers being provided with a plurality of transparent deformation sections operable to be deformed to a specified shape by one of injection of fluid and discharge of fluid; a fluid channel unit possessing one of structure forming a first channel and a second channel in common and structure forming the first channel and the second channel separately, the first channel being a transparent fluid channel operable to supply fluid to be injected to the deformation sections and the second channel being a transparent fluid channel operable to pass fluid discharged from the deformation sections; a fluid pump unit operable to perform one of discharge of fluid at least to the fluid channel unit and suction of fluid at least from the fluid channel unit; a display panel unit including the transparent panel unit provided over an upper surface of the display panel unit and a screen surface operable to display at least an image; and a controller operable to control one of injection of the fluid to the deformation sections of the transparent panel unit and discharge of the fluid from the deformation sections of the transparent panel unit, according to an image to be displayed on the screen surface of the display panel unit, wherein the deformation sections provided in each of the layers of the transparent panel unit are operable to be deformed to a differently specified shape for at least each of the layers, such that a first layer is arranged to have circular deformation sections and a second layer is arranged to have square shaped deformation sections overlapping the circular deformation sections and the deformation of the first and second layers creates at least one concavo-convex shape at a location on the transparent panel unit. a transparent panel unit including a plurality of layers, each of the layers being provided with a plurality of transparent deformation sections operable to be deformed to a specified shape by one of injection of fluid and discharge of fluid; a fluid channel unit possessing one of structure forming a first channel and a second channel in common and structure forming the first channel and the second channel separately, the first channel being a transparent fluid channel operable to supply fluid to be injected to the deformation sections and the second channel being a transparent fluid channel operable to pass fluid discharged from the deformation sections; a fluid pump unit operable to perform one of discharge of fluid at least to the fluid channel unit and suction of fluid at least from the fluid channel unit; a display panel unit including the transparent panel unit provided over an upper surface of the display panel unit and a screen surface operable to display at least an image; and a controller operable to control one of injection of the fluid to the deformation sections of the transparent panel unit and discharge of the fluid from the deformation sections of the transparent panel unit, according to an image to be displayed on the screen surface of the display panel unit, wherein the deformation sections provided in each of the layers of the transparent panel unit are operable to be deformed to a differently specified shape for at least each of the layers, such that a first layer is arranged to have circular deformation sections and a second layer is arranged to have square shaped deformation sections overlapping the circular deformation sections and the deformation of the first and second layers creates at least one concavo-convex shape at a location on the transparent panel unit.