Japan Launches Nationwide Crackdown on Illegal Migrants, 19 Thai Nationals Arrested in Nagano

Nationwide Crackdown Begins

Japan has commenced a nationwide crackdown on illegal migrants, with the first major operation on November 14, 2025, leading to the arrest of 19 Thai nationals in Suzaka City, Nagano Prefecture. Police raided a location described as a 'hideout for overstayers,' apprehending individuals on charges of illegal residency and aiding unlawful residence. This action marks the implementation of Japan's new policy aimed at 'eliminate all illegal migrants'.

Details of the Operation

Among those arrested were eight Thai women, aged 26 to 52, who were living in Japan as overstayers. Additionally, ten other Thai men and women, aged 21 to 46, are under investigation in connection with the same case. The primary suspect identified is a 73-year-old Thai woman, who allegedly provided accommodation to a 37-year-old Thai woman despite knowing she had overstayed her visa from May 2022 to October 2025. All individuals face charges under Japan's Immigration Control and Refugee Recognition Act.

Japan's Stricter Immigration Stance

This crackdown aligns with Japan's recently announced 'Zero Illegal Residents Plan for the Safety and Security of the People'. The plan introduces enhanced enforcement measures to address concerns regarding an increasing number of foreign nationals in unlawful status. Japanese immigration authorities aim to reduce the number of foreign nationals with confirmed deportations by half by the end of 2030, partly by doubling government-funded deportations within three years. The number of foreign nationals staying illegally in Japan beyond their authorized period of stay was estimated at approximately 71,000 as of July 1, 2025, a significant decrease from a peak of around 300,000 in May 1993.

Context of Illegal Residency

Historically, Japan's immigration laws have been strict, with many foreign workers entering the country legally but subsequently overstaying their visas, often due to employment opportunities. People from Thailand have historically been among the top nationalities for illegal residents in Japan. The Immigration Control Law, revised in 1989, generally does not accept most foreigners coming to Japan for work unless they fall under skilled categories or are descendants of Japanese nationals. Foreigners working in Japan are required to adhere to the rules set forth by the Immigration Control and Refugee Recognition Act, with violations leading to severe penalties for both the individual and the employer.