Japan National Route 400

{{Infobox road/shieldmain/|province=¬|state=Japan|type=National|county=|route=400|subtype=}}
{{Infobox road/name/|province=¬|state=Japan|type=National|subtype=|route=400|county=}}
{{Infobox road/shieldmain/\|province=¬\|state=Japan\|type=National\|county=\|route=400\|subtype=}} {{Infobox road/name/\|province=¬\|state=Japan\|type=National\|subtype=\|route=400\|county=}}
Route information
Length	225.7 km (140.2 mi)

National Route 400 is a national highway of Japan connecting Mito, Ibaraki and Nishiaizu, Fukushima in Japan, with a total length of 225.7 km (140.24 mi).

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