During his first May Day event since taking office, Prime Minister Shigeru Ishiba vowed on Saturday to pass wage hikes that keep up with Japan's soaring cost of living.

"We'll definitely realize wage hikes that would not succumb to rising prices," Ishiba said at the May Day central convention in Tokyo hosted by the Japanese Trade Union Confederation, or Rengo.

It was the third year in a row for a Japanese prime minister to attend Rengo's May Day event. In 2023, Prime Minister Fumio Kishida became the first Japanese leader to attend the event in nine years.

The ruling Liberal Democratic Party, which is headed by Ishiba, has grown closer to Rengo recently. The first policy discussion in 16 years between the prime minister and the chief of Rengo — the umbrella organization for Japanese labor unions — was held earlier this month, while Tomoko Yoshino became the first Rengo president in 20 years to attend an LDP convention last month.

Noting that the wage hike levels agreed upon during this spring's labor-management negotiations appear to be exceeding those of last year, Ishiba said, "We hope to spread this momentum (of higher wages) to smaller companies, regional areas and nonregular employment."

Ishiba also said that U.S. tariffs on Japanese products "could have a major impact on the domestic industry."

"We'll be strong in our negotiations with the U.S. government to protect Japanese workers," he said.

Meanwhile, Yoshino said, "As salaries are a mirror of the value of workers' labor, wage hikes hold a meaning of paying respect to the value and dignity of workers."

According to the organizer, about 29,200 people attended Saturday's event, including Tokyo Gov. Yuriko Koike and labor minister Takamaro Fukuoka.

A declaration was adopted featuring a goal of spreading the moves of wage hikes to smaller firms and businesses without labor unions through building a society in which each individual is respected, diversity is recognized and no one is left behind.

As this year marks the 80th anniversary of the end of World War II, participants also adopted a special resolution emphasizing the need to pass on the lessons of war and the importance of peace to future generations.