Specifically, the forced air cooling portion 405 forcibly cools the heat sink portion 245 with cooling air. The forced air cooling portion 405 includes, for example, a cooling fan 451 that generates cooling air with an impeller in rotary motion. In the example of FIG. 5, provided are the cooling fans 451 corresponding one-to-one to the pair of heat sink portions 245.

The cooling fans 451 are each provided so as to blow cooling air to the corresponding heat sink portion 245 from one side opposite to the other side closer to the lower wall part 42A. The cooling fans 451 each blow, to the corresponding heat sink portion 245, cooling air generated by the impeller in rotary motion, so that the heat sink portion 245 is forcibly cooled.

Similarly to the vehicular display devices 1, 201, and 301 described above, the vehicular display device 401 described above enables inhibition of thermal degradation, so that inhibition of an increase in size and inhibition of thermal degradation can be both achieved.

Thus, for the vehicular display device 401 described above, each cooling fan 451 included in the forced air cooling portion 405 forcibly cools the heat sink portion 245, so that heat, such as condensing heat, conducted from either inner wall part 41A to the corresponding lower wall part 42A can be more efficiently dissipated outward. As a result, the vehicular display device 401 enables more reliable inhibition of a rise in the temperature of the casing 4, so that thermal degradation can be more reliably inhibited.