Right Socialist Party of Japan

Prewar period

As the roots of the proletarian parties that later merged into the JSP, there existed the urban labor-based Shakai Taishūtō (right wing, modeled on the British Labour Party), the agrarian and poverty-relief activist Japan Labour-Farmer Party (centrist), and the Marxist Labour-Farmer Party (left wing). In the search for a single proletarian party, the Shakai Taishūtō was formed. In 1940, those mainly from the Japan Labour-Farmer Party lineage promoted merger into Prime Minister Konoe’s New Order Movement and the Imperial Rule Assistance Association, leading to the dissolution of the Social Masses Party.

From founding to the left-right split

The Japan Socialist Party was founded in September 1945, centered on the Shakai Taishūtō faction that had kept distance from the wartime collaborationist system, incorporating the Japan Labour-Farmer Party and Labour-Farmer Party factions. Due to the subsequent public office purge, most Japan Labour-Farmer Party politicians were removed from politics. In the 1947 general election, the JSP became the largest party and the Katayama cabinet was formed. Party and government operations were centered on the Shakai Taishūtō (Nishio faction) figures such as Prime Minister Tetsu Katayama and Chief Cabinet Secretary Suehiro Nishio.

Katayama and the subsequent Ashida cabinets saw conflicts, such as the clash between Nishio Suehiro and Rikizō Hirano over the handling of the public office purge. Scandals such as the Nishio donation affair and the Shōwa Denkō scandal (both later resulting in Nishio’s acquittal) created a dirty image, rapidly eroding support inside and outside the party.

Meanwhile, many labor unions under strong Japanese Communist Party influence in the immediate postwar period shifted toward more realistic democratization movements (Mindo), strengthening the left wing’s base within the party.

Right Socialist Party (1951–1955)

Following the collapse of the Katayama and Ashida cabinets and disputes over their evaluation, the JSP underwent multiple splits. In 1951, it divided over support for the San Francisco Peace Treaty and the (old) Japan-U.S. Security Treaty. The group favoring the Peace Treaty and opposing the Security Treaty was conveniently called the "Right Socialist Party" (abbreviated "Right Socialist"). Both sides claimed the name "Japan Socialist Party."

Initially, the chairmanship was left vacant, with Inejirō Asanuma serving as Secretary-General. Later, Jōtarō Kawakami, whose purge had been lifted, became chairman. During this chaotic period, the JSP’s security policy, while breaking with militarism, began to center on anti-rearmament.

With the end of the public office purge, Japan Labour-Farmer Party lineage (Kawakami faction) politicians returned to politics from the 1952 election and joined the Right Socialist Party. However, party organization was weak, and elections relied on prominent local politicians' personal support networks. In contrast, the Left Socialist Party built strong organizational campaigns based on labor unions that had broken from Communist Party guidance. The Right was thus sometimes called "the right with faces."

The Right Socialist Party started with 29 seats, rising to 57 in the 1952 election, 66 in 1953, and 67 in 1955. On 13 October 1955, through the efforts of the Kawakami and Suzuki factions, the Left and Right Socialist Parties reunified. Right Socialist chairman Kawakami became a JSP advisor, and Asanuma became Secretary-General of the unified party.

In May 1955, as reunification talks advanced, the Right Socialist Party’s Central Executive Committee adopted the Right Socialist Platform (右社綱領, also known as the Unified Socialist Party Platform Draft). This document articulated the party’s democratic-socialist principles, including peaceful parliamentary revolution, rejection of both communism and fascism, and a broad mass-party character. It served as the Right’s formal proposal for the platform of the reunified party. At the October unification congress a compromise document, the Unified Socialist Party Platform, was adopted as the official platform of the reunified Japan Socialist Party.^[9][10]

After the Structural Reform Debate

In 1959, the Nishio expulsion issue arose, leading to the departure of the Nishio faction and roughly half of the Kawakami faction from the JSP to form the Democratic Socialist Party. The remaining old right wing consisted of the surviving Kawakami faction.

Thereafter, structural reform theory, originating from the realistic Italian Communist Party's view of revolution as continuous reform, began to be studied in Japan and influenced JSP and JCP staff. In the JCP it was suppressed, but in the JSP, where the left wing's theory was one-stage revolution, structural reform theory was accepted as a way to reconcile revolutionary theory with parliamentary democracy by positioning daily reforms as revolutionary.

Structural reform theory was officially adopted by the party shortly after the 1960 assassination of Asanuma. The largest faction, the Socialist Research Association (Sasaki faction) to which Eda belonged, opposed it, leading Eda to break with the Sasaki faction. From then on, the Eda, Wada, and Kawakami factions promoting structural reform were called the right wing.

After the JSP’s major defeat in the 1969 general election, Eda sought to achieve a non-LDP government through cooperation with the Kōmeitō and DSP. However, the majority of the Wada faction’s successor (Seiichi Katsumata faction) shifted leftward. Plans for a new party by the Eda faction, Kōmeitō, and DSP emerged but stalled due to the party’s leftward tilt, especially the growth of the far-left Socialist Association faction.

At the 1977 JSP congress, the Socialist Association faction moved to expel Eda, who then left the party and died shortly afterward. Backlash against the Socialist Association strengthened the right wing's ranks. Thereafter, the goal became achieving power through the JSP–Kōmeitō–DSP alliance that Eda had advocated.

The right wing tended to prioritize realistic power acquisition over ideology and ideals, and de facto accepted the existence of the Self-Defense Forces. However, with the exception of some figures like Saburō Eda, there was a lack of politicians capable of presenting a concrete vision for a new government, which proved a significant obstacle to organizational growth. Their stance on diplomacy and security led some to describe the right wing as having a "halfway image—neither conservative nor innovative."

After the Murayama Cabinet

By the time the Murayama cabinet was formed, the Soviet Union had collapsed and even former left-wing politicians who had praised Soviet-style socialism had adopted moderate social-democratic thinking, so there were few sharp ideological divides within the party. The media conveniently labeled as "right wing" those politicians who prioritized defeating the LDP, even through cooperation with Ichirō Ozawa, and were prepared to form new democratic or liberal parties.

After the formation of the Democratic Party of Japan, many moved to the DPJ. As of 2018, many Diet members inheriting the old JSP right-wing lineage belonged to the Constitutional Democratic Party of Japan (2017), though some were in other parties such as the Democratic Party for the People.

In May 1995, shortly before its transformation into the Social Democratic Party, the Japan Socialist Party adopted the 95 Declaration (95 Declaration – New Basic Values and Policy Goals), which set out basic values of justice, coexistence, peace and creativity and medium-term policy goals for a post-Cold War “mature society.”^[11]

House of Representatives

More information Election, Leader ...

Election	Leader	Votes	%	Seats	+/–	Position	Status
1952	Jōtarō Kawakami	4,108,274	11.63	57 / 466	new	3rd	Opposition
1953		4,677,833	13.52	66 / 466	9	4th	Opposition
1955		5,129,594	13.86	67 / 467	1		Opposition
Source: [12]

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