The Mitsubishi Jushi Case (1973) — Horizontal Application of Constitutional Rights

Introduction

The Mitsubishi Jushi Case (Mitsubishi Heavy Industries Case, Saiko Saibansho, Grand Bench, December 12, 1973) is the leading Japanese authority on the horizontal application (indirect effect) of constitutional rights to relationships between private parties. The case addressed the extent to which the constitutional guarantees of freedom of expression, thought, and conscience constrain the exercise of private power — specifically, an employer’s right to dismiss an employee.

The Grand Bench’s decision established the doctrinal framework through which constitutional values are mediated into private law via the general clauses of the Civil Code, particularly Article 90 (public order and good morals) and Article 1(3) (abuse of rights). The case has influenced virtually every subsequent Japanese decision involving the interaction between constitutional rights and private law.

Facts

The plaintiff was an employee of Mitsubishi Heavy Industries, one of Japan’s largest industrial corporations. During working hours and on the company’s premises, the plaintiff distributed leaflets to fellow employees that were critical of the company’s management practices, labour policies, and the company’s role in the Vietnam War (the company manufactured military aircraft for the US military).

The company dismissed the plaintiff, citing the distribution of the leaflets as conduct that disrupted workplace order and harmed the company’s reputation. The plaintiff challenged the dismissal, arguing that it violated his constitutional rights to freedom of expression (Article 21 of the Constitution) and freedom of thought and conscience (Article 19).

The Legal Issue

The central legal issue was whether constitutional rights — which by their terms are addressed to the state (“freedom of expression is guaranteed to all persons”) — apply to the conduct of a private employer. If constitutional rights apply only to government action (the state action doctrine), then the employer’s dismissal, even if motivated by hostility to the employee’s expression, would not violate the Constitution. If constitutional rights apply directly to private conduct (the direct effect theory), then the dismissal would be unconstitutional.

The Supreme Court adopted a third approach — the indirect effect theory — holding that constitutional rights do not directly bind private parties but are mediated through the general clauses of the Civil Code.

The Supreme Court’s Holding

The Grand Bench held that the dismissal was an abuse of rights and therefore invalid. The Court’s reasoning established a three-part framework for evaluating whether private conduct that restricts constitutional rights is lawful.

The Three-Part Test

First, the Court examined the nature and degree of the restriction on the employee’s freedom of expression. The restriction (dismissal) was the most severe sanction an employer can impose and effectively silenced the employee’s political expression. The Court noted that the leaflets were distributed in a non-disruptive manner and did not incite violence or harassment.

Second, the Court assessed the reasonableness of the employer’s action in light of the company’s legitimate business interests. The company argued that the leaflets damaged its reputation and disrupted workplace harmony. The Court held that while the company had a legitimate interest in maintaining order and protecting its reputation, the dismissal was disproportionate because the leaflets were distributed to a limited audience of fellow employees and did not cause significant disruption.

Third, the Court balanced the employee’s interest in freedom of expression against the employer’s interest in maintaining a productive workplace. The balance tipped in favour of the employee because: (a) the content of the leaflets addressed matters of public concern (the company’s involvement in the Vietnam War), (b) the employee’s expression was not defamatory or false, and (c) the company could have achieved its legitimate objectives through less restrictive means (such as warnings or disciplinary action short of dismissal).

Application of Abuse of Rights and Public Order

The Court held that the dismissal constituted an abuse of rights under Article 1(3) of the Civil Code and was therefore void. The Court also invoked Article 90 (public order and good morals), holding that a dismissal that restricts an employee’s constitutional rights “excessively” is contrary to public order.

The Court stated: “The constitutional guarantee of fundamental rights should be respected as far as possible in relations between private individuals, and an act that unreasonably restricts fundamental rights in a way that goes beyond socially acceptable limits constitutes an abuse of rights and is invalid.”

The Indirect Effect Doctrine

The Mitsubishi Jushi Case established the indirect effect (kan setsu teki kōryoku) or mittelbare Drittwirkung of constitutional rights in Japan. Under this doctrine:

• Constitutional rights do not directly bind private parties (there is no “state action” requirement in the US sense)
• Constitutional rights are mediated through the general clauses of private law (particularly Articles 1(2), 1(3), and 90 CC)
• Courts must interpret and apply private law rules in light of constitutional values
• The balance between competing rights and interests is determined by the specific context of each case

The indirect effect doctrine has several advantages over the direct effect theory:

• It preserves the distinction between public law (relations between the state and individuals) and private law (relations between individuals)
• It allows the courts to take account of the competing rights and interests of the private parties
• It is consistent with the text of the Constitution, which addresses rights to the state
• It permits a nuanced, context-specific balancing of competing interests

Influence of German Constitutional Theory

The Court’s reasoning in Mitsubishi Jushi was explicitly influenced by German constitutional theory, particularly the Drittwirkung debate. The German Federal Constitutional Court’s Lüth Case (1958), which established the indirect effect of constitutional rights in Germany through the general clauses of the BGB (particularly Section 826 — “good morals” — and the Treu und Glauben principle), was cited by Japanese scholars and indirectly influenced the Court’s approach.

Japanese legal scholars had debated the horizontal application issue throughout the 1960s, with some advocating the direct effect theory (constitutional rights apply directly to private conduct) and most supporting the indirect effect theory (constitutional rights are mediated through private law general clauses). The Supreme Court’s adoption of the indirect effect theory in Mitsubishi Jushi resolved the debate in favour of the latter approach.

Significance

The Mitsubishi Jushi Case is significant for several reasons.

First, it established the doctrinal framework for horizontal application that has been applied in hundreds of subsequent cases involving employment discrimination, consumer contracts, landlord-tenant disputes, and other areas where private power threatens constitutional values.

Second, it represents a high-water mark of judicial protection of employee rights in Japan. The case was decided during a period of social and political ferment, and the Court’s robust protection of political expression in the workplace reflected the broader social context.

Third, the case illustrates the critical role of the general clauses in Japanese private law. Through Articles 1(3) and 90, the Court imported constitutional values into the private law relationship and subjected the employer’s contractual right to dismiss to constitutional constraints.

Subsequent Developments

The Mitsubishi Jushi framework has been applied in numerous subsequent cases, including:

• Employment discrimination cases (dismissal based on political affiliation, religion, or gender)
• Consumer contract cases (manufacturer’s disclaimers of liability for personal injury)
• Landlord-tenant cases (landlord’s refusal to lease to foreign nationals)
• Expulsion from associations (the expulsion of a member from a political party or professional association)

The framework has also been extended to freedom of religion and freedom of association cases, where courts have applied the same three-part balancing test to determine whether private conduct that restricts constitutional rights is lawful.

Conclusion

The Mitsubishi Jushi Case is a landmark of Japanese constitutional and private law. Its establishment of the indirect effect doctrine has shaped the relationship between constitutional rights and private power in Japan for over five decades. The case represents the Japanese Supreme Court at its most engaged with comparative constitutional law and at its most protective of individual rights against private encroachment. The three-part balancing test remains the standard framework for evaluating the horizontal application of constitutional rights in Japan.