Assassination of Prime Minister Inukai Tsuyoshi

Assassination of Prime Minister Inukai Tsuyoshi
Name	Inukai Tsuyoshi
Native name	犬養 毅
Birth date	1855-06-05
Death date	1932-05-15
Birth place	Okayama Domain
Death place	Tokyo
Occupation	Politician, Prime Minister
Office	Prime Minister of Japan
Term start	1931-12-13
Term end	1932-05-15
Party	Rikken Seiyūkai

Assassination of Prime Minister Inukai Tsuyoshi

The assassination of Prime Minister Inukai Tsuyoshi occurred on 15 May 1932 in Tokyo, when a group of young naval officers and army cadets stormed the residence of Prime Minister Inukai, fatally shooting him during what became known as the May 15 Incident. The killing marked a climactic moment in the erosion of civilian party rule under Rikken Seiyūkai and intensified the influence of the Imperial Japanese Navy, Imperial Japanese Army, Sakurakai, and ultranationalist movements including elements tied to the Young Officers Movement and the League of Blood Incident. The incident accelerated political polarisation in the Empire of Japan and contributed to the consolidation of military power preceding the Second Sino-Japanese War.

Background

Inukai Tsuyoshi, leader of Rikken Seiyūkai and a veteran of Meiji-era politics, served as Prime Minister amid crises following the Mukden Incident and the Manchurian Incident and the invasion of Manchuria by the Kwantung Army. His cabinet grappled with international pressure from the League of Nations and diplomatic tensions with United Kingdom, United States, France, and Republic of China (1912–49). The global Great Depression and the Washington Naval Treaty legacy strained Japan’s economy and naval policy, provoking friction between civilian politicians such as Inukai and factions in the Imperial Japanese Navy General Staff and Imperial General Headquarters over expansionism, naval construction, and budgetary allocations.

The Sakurakai and Naval/Air Force Dissatisfaction

The Sakurakai (Cherry Blossom Society) was a secret society formed by young Imperial Japanese Army officers from the Kwantung Army and domestic garrisons who sought a Showa Restoration and the overthrow of party cabinets, aligning with ultranationalist groups such as Kokuhonsha and supporters of Kōkoku Ishin. Dissatisfaction also existed within the Imperial Japanese Navy Air Service and among young naval aviators influenced by thinkers like Sadao Araki and Kunitake Sato, who criticized parliamentary cabinets including Tsuyoshi Inukai for perceived weakness in foreign policy toward Soviet Union (1922–1991), Republic of China, and for failing to allocate sufficient funding to Kamikaze-era aviation programs and capital ship construction such as planned Kongo-class battleship expansions. The interplay of the Young Officers Movement, secret societies, and nationalist organizations including Aikokusha and Black Dragon Society created a volatile network that targeted symbols of party governance like Inukai and Rikken Seiyūkai leadership.

Events of 15 May 1932 (May 15 Incident)

On 15 May 1932 a group of seventeen young Imperial Japanese Navy officers and Imperial Japanese Army cadets, many with links to the Sakurakai and the Young Officers Movement, assembled near the Prime Minister’s residence in the Akasaka Palace area of Tokyo. The conspirators included figures who had served in Manchuria under the Kwantung Army and those sympathetic to ultranationalist publications such as Kokumin Shimbun and Nippon Kaigi precursor groups. They fired upon the residence, killing Inukai Tsuyoshi and wounding staff; the attackers also attempted to strike other political figures associated with Rikken Minseitō and Seiyūkai leadership. The shooting occurred in the context of simultaneous unrest, including assassination attempts connected to the earlier League of Blood Incident (1932) conspirators.

Assassination and Immediate Aftermath

Inukai was mortally wounded in his residence and died shortly thereafter, provoking shock across Tokyo and among international legations including representatives from the United States and the United Kingdom. The assassins surrendered to police, asserting ideological motives tied to a purported need to remove party politicians accused of obstructing national revitalization and military prerogative. Public reaction varied: nationalist newspapers like Yorozu Choho and Kokumin Shimbun expressed ambivalence or tacit support, while liberal organs and leaders within Rikken Seiyūkai condemned the violence. The assassination immediately toppled the civilian cabinet and enabled increased intervention by the Imperial Japanese Army General Staff and Imperial Japanese Navy General Staff in cabinet formation.

Political Consequences and Government Response

Following Inukai’s death, the remaining cabinet resigned and the formation of a succession government involved greater consultation with senior military chiefs such as Admiral Keisuke Okada and army leaders like General Jotaro Watanabe. The incident weakened party politics—not to be linked—but practically led to administrations dominated by genrō influence and military-approved cabinets, setting precedent for the 1930s premierships of figures associated with the Taishō Democracy backlash and later the Hiranuma Kiichirō and Admiral Mitsumasa Yonai eras. Internationally, the assassination complicated Japan’s relations with the League of Nations and foreign powers that had criticized Japanese actions in Manchuria and raised questions about the rule of law under the Constitution of the Empire of Japan (Meiji Constitution).

Trials, Punishments, and Legal Outcomes

The assassins were arrested and subjected to trials in the Tokyo District Court and subsequent appeals in the Supreme Court of Judicature of Japan, where public sympathy and nationalist pressures affected sentencing. Several conspirators received prison terms rather than capital punishment, reflecting judges’ leniency influenced by nationalist sentiment and the climate within Imperial Japanese Army and Imperial Japanese Navy circles. The legal outcomes, including commuted sentences and early releases during the late 1930s, drew criticism from liberal politicians, human rights advocates, and newspapers such as Asahi Shimbun and Mainichi Shimbun, while conservative organs framed the punishments as excessive.

Legacy and Historical Significance

The assassination of Inukai Tsuyoshi is widely regarded by historians of Showa period Japan as a turning point that accelerated militarism, undermined Rikken Seiyūkai and party governance, and contributed to the chain of events leading to expanded Japanese aggression in Asia, including the Second Sino-Japanese War and eventual entry into Pacific War. It influenced memoirs and analyses by figures such as Henry L. Stimson observers, Japanese statesmen, and scholars of Japanese imperialism, and remains a focal event in studies of political violence, civil–military relations, and ultranationalist movements like the Sakurakai and Black Dragon Society. The site of the assassination and Inukai’s grave are referenced in commemorations, debates in Diet of Japan historiography, and museum exhibits on prewar political turmoil.

Category:1932 in Japan Category:Assassinations in Japan Category:Showa period politics