Japan National Route 146

{{Short description|Road in Japan}}

{{onesource|date=October 2024}}

{{Expand Japanese|topic=transp|date=October 2024}}

{{Infobox road

|country=JPN

|type=National

|route=146

|image_notes=Route 146 in Karuizawa

|maint=

|alternate_name=Japan Romantic Road

|map={{Maplink2|zoom=9|frame=yes|plain=yes|frame-align=center|frame-width=300|frame-height=300|frame-latitude=36.4478|frame-longitude=138.6104

|type=line|stroke-color=#cc0000|stroke-width=2

}}

|map_custom=yes

|image=Route 146 end.JPG

|length_km=30.2

|length_round=

|length_ref={{cite web|title=一般国道の路線別、都道府県別道路現況|trans-title=Road statistics by General National Highway route and prefecture|url=http://www.mlit.go.jp/road/ir/ir-data/tokei-nen/2016/pdf/d_genkyou26.pdf|language=ja|publisher=Ministry of Land, Infrastructure, Transport and Tourism|access-date=19 February 2020}}

|established=1953

|direction_a=South

|terminus_a={{jct|country=JPN|Route|18}} in Karuizawa, Nagano

|junction=

|direction_b=North

|terminus_b={{jct|country=JPN|Route|144|Route|145}} in Naganohara, Gunma

|previous_type=Route

|previous_route=145

|next_type=Route

|next_route=147

|browse=

}}

National Route 146 is a national highway of Japan connecting Naganohara, Gunma and Karuizawa, Nagano in Japan, with a total length of 30.2 km (18.77 mi).