Mosque Construction Issues Across Japan: Comparing Yokohama, Fujisawa, Itoshima, and Kawagoe
This article organizes publicly available information into a single account. Where it describes an arrest or an ongoing investigation, that reflects only one stage of criminal procedure and does not mean guilt has been established (the presumption of innocence applies). We will update this article as new information becomes available, including the outcome of prosecution, non-prosecution, or trial. This article is not intended to unfairly disparage any individual, group, nationality, ethnicity, or belief, and aims to provide objective, fact-based information.
As Japan's Muslim community has grown, a series of stories have emerged about mosque construction and operation in different parts of the country. Some cases have drawn clear opposition, while others have proceeded through administrative channels without major conflict. This article organizes this site's prior coverage by region to give an overview of how mosque-related issues have actually played out.
Yokohama: a case that proceeded through proper channels
In January 2025, Japan's first mosque built around an Indonesian community, the "Indonesia Mosque," broke ground in Yokohama. Built on a 397-square-meter site with capacity for more than 600 worshippers, construction costs were reported at roughly 240 million yen (related article). No significant opposition movement was reported in this case, which stands as an example of a community-led project that proceeded through planned channels.
Fujisawa: a case where explanation and conflict intersected
In Fujisawa, Kanagawa Prefecture, the process around a mosque construction plan has been reported in relatively close detail. In December 2025, the city published an official document titled "Regarding Inquiries About Mosque Construction," explaining that the project was being carried out by a private operator on private land with no subsidies from the city (related article). But by April 2026, opposing and supporting residents held a demonstration near JR Fujisawa Station that turned into a clash, with concerns over burial practices and noise from prayer calls cited as background for the opposition (related article). By July, an online petition against construction had gathered more than 33,000 signatures, while the Fujisawa city assembly rejected all related petitions (related article). Even though the city government offered an explanation early on, disagreement among residents did not subside.
Itoshima: a question of advance notice
In Itoshima, Fukuoka Prefecture, a mosque construction plan by the general incorporated association Fukuoka Itoshima International Cultural Exchange Association has emerged. The land, worth roughly 120 million yen, has already been purchased, but voices on social media have pointed to insufficient advance notice to residents (related article). Unlike the Fujisawa case, the reporting here centers less on whether the mosque should be built and more on the order and timing of the explanation given to residents.
Kawagoe: a case that bypassed proper procedure
In Kawagoe, Saitama Prefecture, a weekly magazine reported that the city had demanded the removal of a mosque that had been built without the required construction confirmation application. Nearby residents have pointed to a lack of dialogue with the administration (related article). This differs in character from the Yokohama, Fujisawa, and Itoshima cases: the issue here is less about whether a religious facility is appropriate and more about legal compliance with construction procedures.
Putting it together
Lining up these cases shows that mosque-related issues in Japan are not uniform. Yokohama appears to have involved sufficient process and explanation, with no major conflict reported; Fujisawa saw disagreement persist even after the city explained itself; Itoshima's issue centered on the timing of advance notice; and Kawagoe involved construction that bypassed proper procedure entirely. Rather than treating mosque construction as synonymous with conflict, it is worth distinguishing each case's specific circumstances and whether proper procedure was followed.
Current status: In Fujisawa, both construction-related activity and opposition voices appear to be continuing even after the city assembly rejected the petitions against it. Several threads remain open, including how the unauthorized mosque case in Kawagoe is resolved and how the Itoshima plan progresses. This site will update this article and add further related coverage as developments occur.