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| 国道178号 | ||||
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| Route information | ||||
| Length | 201 km[1] (125 mi) | |||
| Major junctions | ||||
| West end | Prefectural Road 328 in Iwami, Tottori | |||
| East end |  National Route 175 in Maizuru, Kyoto | |||
| Location | ||||
| Country | Japan | |||
| Highway system | ||||
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National Route 178 is a national highway of Japan connecting Maizuru, Kyoto and Iwami, Tottori in Japan, with a total length of 201 km (124.9 mi).
