Imperial Japanese Army General Staff Office
参謀本部 (Sanbō Honbu)
Postcard with view of Imperial Japanese Army General Staff Office HQ,c. 1910
Founded	24 December 1878
Disbanded	September 1945
Country	Empire of Japan
Allegiance	Emperor of Japan
Branch	Imperial Japanese Army
Type	Military staff
Part of	Imperial General Headquarters
Headquarters	Tokyo
Colors	Red White
Commanders
First Chief	Yamagata Aritomo
Last Chief	Yoshijirō Umezu
Insignia
The IJA ensign

TheImperial Japanese Army General Staff Office (参謀本部,Sanbō Honbu), also called the Army General Staff, was one of the two principal agencies charged with overseeing theImperial Japanese Army (IJA).

TheArmy Ministry (陸軍省,Rikugunshō) was created in April 1872, along with theNavy Ministry, to replace the Ministry of Military Affairs (Hyōbushō) of the earlyMeiji government. Initially, the Army Ministry was in charge of both administration and operational command of the Imperial Japanese Army however, from December 1878, the Imperial Army General Staff Office took over all operational control of the Army, leaving the Army Ministry only with administrative functions. The Imperial Army General Staff was thus responsible for the preparation ofwar plans; themilitary training and employment of combined armsmilitary intelligence; the direction of troop maneuvers; troop deployments; and the compilation of field service military regulations, military histories, andcartography.

The Chief of the Army General Staff was the senior ranking uniformed officer in the Imperial Japanese Army and enjoyed, along with the Army Minister, the Navy Minister, and theChief of the Navy General Staff, direct access to theEmperor. In wartime, the Imperial Army General Staff formed part of the army section of theImperial General Headquarters, anad hoc body under the supervision of the emperor created to assist in coordinating overall command.

Following the overthrow of theTokugawa shogunate in 1867 and the "restoration" of direct imperial rule, the leaders of the newMeiji government sought to reduce Japan's vulnerability to Westernimperialism by systematically emulating the technological, governing, social, and military practices of the Western European great powers. Initially, underŌmura Masujirō and his newly created Ministry of the Military Affairs (Hyōbu-shō), the Japanese military was patterned after that ofFrance. However, the stunning victory ofPrussia and the other members of theNorth German Confederation in the 1870/71Franco-Prussian War convinced theMeiji oligarchs of the superiority of thePrussian military model and in February 1872,Yamagata Aritomo andOyama Iwao proposed that the Japanese military be remodeled along Prussian lines. In December 1878, at the urging ofKatsura Taro, who had formerly served as amilitary attaché to Prussia, theMeiji government fully adopted thePrussian/German general staff system (Großer Generalstab) which included the independence of the military from civilian organs of government, thus ensuring that the military would stay abovepolitical party maneuvering, and would be loyal directly to the emperor rather than to aPrime Minister who might attempt to usurp the emperor's authority.

The administrative and operational functions of the army were divided between two agencies. A reorganized Ministry of War served as the administrative, supply, and mobilization agency of the army, and an independent Army General Staff had responsibility for strategic planning and command functions. The Chief of the Army General Staff, with direct access to the emperor could operate independently of the civilian government. This complete independence of the military from civilian oversight was codified in the 1889Meiji Constitution which designated that the Army and Navy were directly under the personal command of the emperor, and not under the civilian leadership orCabinet.

Yamagata became the first chief of the Army General Staff in 1878. Thanks to Yamagata's influence, the Chief of the Army General Staff became far more powerful than the War Minister. Furthermore, a 1900 imperial ordinance (Military Ministers to be Active-Duty Officers Law [ja] (軍部大臣現役武官制,Gumbu daijin gen'eki bukan sei)) decreed that the two service ministers had to be chosen from among thegenerals orlieutenant generals (admirals orvice admirals) on the active duty roster. By ordering the incumbent War Minister to resign or by ordering generals to refuse an appointment as War Minister, the Chief of the General Staff could effectively force the resignation of the cabinet or forestall the formation of a new one.

Of the seventeen officers who served as Chief of the Army General Staff between 1879 and 1945, three were members of theImperial Family (Prince Arisugawa Taruhito,Prince Komatsu Akihito, andPrince Kan'in Kotohito) and thus enjoyed great prestige by virtue of their ties to the Emperor.

TheAmerican occupation authorities abolished the Imperial Army General Staff in September 1945.

The Organization of the Army General Staff Office underwent a number of changes during its history. Immediately before the start of thePacific War, it was divided into four operational bureaus and a number of supporting organs:

Chief of the Army General Staff (general or Field Marshal)
Vice Chief of the Army General Staff (lieutenant general)

• General Affairs (personnel, accounting, medical, mobilization planning)^[1]
• G-1 (Operations)
  • Strategy and Tactics Department
  • Land Survey Department (or Land Surveying Bureau)^[2]
• G-2 (Intelligence)
  • Russia Department
  • Europe and North America Department
  • China Department
  • Others Department
• G-3 (Transport & Communications)
• G-4 (Historical and Maps)^[3]
• G-5 (Fortifications) [from Jan 1889 – Dec 1908]
• General Staff College

Note: The given rank for each person is the rank the person held at last, not the rank the person held at the time of their post as Chief of the Army General Staff. For example, the rank of Field Marshal existed only in 1872/73 and from 1898 onward.

No.	Portrait	Chief of the General Staff	Took office	Left office	Time in office
1		Aritomo, YamagataField Marshal CountYamagata Aritomo 山縣 有朋 (1838–1922)	24 December 1878	4 September 1882	3 years, 254 days
2		Iwao, ŌyamaField Marshal Ōyama Iwao 大山 巌 (1842–1916)	4 September 1882	13 February 1884	1 year, 162 days
3		Aritomo, YamagataField Marshal Marquis Yamagata Aritomo 山縣 有朋 (1838–1922)	13 February 1884	22 December 1885	1 year, 312 days
4		Taruhito, ArisugawaGeneral Prince Arisugawa Taruhito 有栖川宮熾仁親王 (1835–1895)	22 December 1885	14 May 1888	2 years, 144 days
5		Takeo, OzawaLieutenant General Ozawa Takeo [ja] 小沢武雄 (1844–1926)	14 May 1888	9 March 1889	301 days
6		Taruhito, ArisugawaGeneral Prince Arisugawa Taruhito 有栖川宮熾仁親王 (1835–1895)	9 March 1889	15 January 1895 †	5 years, 318 days
7		Akihito, KomatsuField Marshal Prince Komatsu Akihito 小松宮彰仁親王 (1846–1903)	26 January 1895	20 January 1898	2 years, 359 days
8		Soroku, KawakamiGeneral Kawakami Soroku 川上 操六 (1848–1899)	20 January 1898	11 May 1899 †	1 year, 111 days
9		Iwao, ŌyamaField Marshal Prince Ōyama Iwao 大山 巌 (1842–1916)	16 May 1899	20 June 1904	5 years, 35 days
10		Aritomo, YamagataField Marshal Prince Yamagata Aritomo 山縣 有朋 (1838–1922)	20 June 1904	20 December 1905	1 year, 183 days
11		Iwao, ŌyamaField Marshal Prince Ōyama Iwao 大山 巌 (1842–1916)	20 December 1905	11 April 1906	112 days
12		Gentarō, KodamaGeneral Kodama Gentarō 兒玉 源太郎 (1852–1906)	11 April 1906	23 July 1906 †	103 days
13		Yasukata, OkuField Marshal BaronOku Yasukata 奥 保鞏 (1847–1930)	30 July 1906	20 January 1912	5 years, 174 days
14		Yoshimichi, HasegawaField Marshal Hasegawa Yoshimichi 長谷川 好道 (1850–1924)	20 January 1912	17 December 1915	3 years, 331 days
15		Yūsaku, UeharaField Marshal Uehara Yūsaku 上原 勇作 (1856–1933)	17 December 1915	17 March 1923	7 years, 90 days
16		Misao, KawaiGeneral Kawai Misao [ja] 河合操 (1864–1941)	17 March 1923	2 March 1926	2 years, 350 days
17		Soroku, SuzukiGeneral Suzuki Soroku [ja] 鈴木荘六 (1865–1940)	2 March 1926	19 February 1930	3 years, 354 days
18		Hanzo, KanayaGeneral Kanaya Hanzo [ja] 金谷範三 (1873–1933)	19 February 1930	23 December 1931	1 year, 307 days
19		Kotohito, Kan'inField Marshal Prince Kan'in Kotohito 閑院宮載仁親王 (1865–1945)	23 December 1931	3 October 1940	8 years, 285 days
20		Sugiyama, HajimeField Marshal Hajime Sugiyama 杉山 元 (1880–1945)	3 October 1940	21 February 1944	3 years, 141 days
21		Tojo, HidekiGeneral Hideki Tojo 東條 英機 (1884–1948)	21 February 1944	18 July 1944	148 days
22		Umezu, YoshijirōGeneral Yoshijirō Umezu 梅津美治郎 (1882–1949)	18 July 1944	September 1945	1 year, 45 days

• Army Ministry

Wikimedia Commons has media related toGeneral Staff of the Imperial Japanese Army.

• U.S. War Department,Handbook of Japanese Military Forces, TM-E 30-480 (1945; Baton Rouge and London: Louisiana State University Press, 1991, reprint).
• Hayashi, Saburo; Cox, Alvin D (1959).Kogun: The Japanese Army in the Pacific War. Quantico, Virginia: The Marine Corps Association.
• Shin'ichi Kitaoka, "Army as Bureaucracy: Japanese Militarism Revisited",Journal of Military History, special issue 57 (October 1993): 67–83.
• Edgerton, Robert B. (1999).Warriors of the Rising Sun: A History of the Japanese Military. Westview Press.ISBN 0-8133-3600-7.
• Harries, Meirion (1994).Soldiers of the Sun: The Rise and Fall of the Imperial Japanese Army. Random House.ISBN 0-679-75303-6.

• Imperial Japanese Army
• Army chiefs of staff

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