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| settlement_type= Special city | image_skyline= Tsukuba Center & Mt.Tsukuba01.jpg | image_caption= View of Mount Tsukuba and Tsukuba Center | image_flag= Flag of Tsukuba Ibaraki.JPG | image_map=Tsukuba in Ibaraki Prefecture Ja.svg | lat_deg= 36 | lat_min= 2 | lat_sec= | lon_deg= 140 | lon_min= 4 | lon_sec= | region= Kantō | prefecture= Ibaraki Prefecture | district= | mayor= Kenichi Ichihara | area_km2= 284.07 | population= 217,315 | population_as_of= October 1, 2012 | density_km2= 765.00 | tree= Japanese zelkova | flower= Hoshizaki-yukinoshita | bird= Ural owl | city_hall_address= 2530-2 Karima, Tsukuba-shi, Ibaraki | city_hall_postal_code= 305-8555 | website= }} is a city located in Ibaraki Prefecture, Japan. It is known as the location of the , a planned science park developed in the 1960s. As of October 1, 2012, the city has an estimated population of 217,315, with 90,151 households and a population density of 765 persons per km². The total area is . Mount Tsukuba, particularly well known for its toad-shaped Shinto shrine, is located on the city's northern border. Tsukuba is a twin city of Irvine, California, Milpitas, California, and Cambridge, Massachusetts〔("A Message from the Peace Commission: Information on Cambridge's Sister Cities," ) February 15, 2008. Retrieved 2008-10-12.〕〔Richard Thompson. ("Looking to strengthen family ties with 'sister cities'," ) ''Boston Globe'', October 12, 2008. Retrieved 2008-10-12.〕 in the United States of America, and Grenoble in France. == Etymology == The , a national geography completed in 721, says Tsukuba was named after a noble called . According to the book, Tsukuba was once called . Under the reign of (Emperor Sujin), Tsukuha no Mikoto from the was appointed as its governor. He had a strong desire to leave his name in history, so he renamed the province to Tsukuha, which is now pronounced Tsukuba.〔 This description may be unhistorical, since Emperor Sujin is now considered to be a legendary person, but at least it suggests the name Tsukuba has been used from ancient times. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Tsukuba, Ibaraki」の詳細全文を読む スポンサード リンク
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