A vehicular display device according to a fifth embodiment is different from those according to the first, second, third, and fourth embodiments in that a temperature detector and a controller are provided.

A vehicular display device 501 according to the present embodiment illustrated in FIG. 7 is different from the vehicular display device 401 described above in that a temperature detector 506 and a controller 507 are provided. Except for the difference, the vehicular display device 501 is substantially similar in configuration to the vehicular display device 401 described above.

Specifically, the temperature detector 506 detects the temperature of the inner wall part 41A. The temperature detector 506 includes, for example, a thermistor. The temperature detector 506 is provided, for example, in a focal area FA as described above or in the vicinity of the focal area FA, on the inner wall part 41A, and detects, for example, a rise in the temperature of the inner wall part 41A due to condensing heat. In the example of FIG. 7, provided are the temperature detectors 506 corresponding one-to-one to the pair of inner wall parts 41A. Each temperature detector 506 outputs, to the controller 507, a detection signal indicating the detected temperature of the inner wall part 41A.