To provide an instrument device that can be downsized.SOLUTION: An instrument device comprises: an information display body 10; multiple light sources that supply illumination light to this information display body 10; a light guide member that is arranged in an illumination path from the light sources to the information display body 10; and a case member 50 that holds this light guide member. The light guide member has: a light guide main body part 41 that is provided corresponding to the information display body 10; and first and second light introduction parts that are provided so as to introduce the illumination light from the light sources. In at least a portion of a space to be formed between the first and second light introduction parts, a connection part 90 as a functional component to be provided integrally with the case member 50 is arranged.SELECTED DRAWING: Figure 5