| 摘要 |
PROBLEM TO BE SOLVED: To improve image quality of a display of a key top and improve visibility from an oblique direction of the display of the key top. SOLUTION: This switch device 1 has a transparent key top 20 on a screen 11 of a liquid crystal display 10, and visually recognizes a display of the screen 11 of the liquid crystal display 10 via the key top 20. In this case, a concave mirror 13 is provided at a back light 12 of the liquid crystal display 10, a transparent diffusion surface 21 is provided on the key top 20, a display of the screen 11 of the liquid crystal display 10 is illuminated by light of the back light 12 that is reflected on the concave mirror 13 to become parallel light, and the display is projected on the diffusion surface 21 of the key top 20.
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