Institutional density and the statutory articulation of security: Japan’s Basic Acts on ocean and space policy

This article explains why security-related claims acquired different statutory forms in Japan’s maritime and space framework legislation. Comparing the policy processes behind the Basic Act on Ocean Policy (2007) and the Basic Space Act (2008), it treats the two laws not as direct measures of total sectoral securitization but as framework-legislation sites in which security-related claims were translated into statutory form. The article argues that this divergence is best explained by institutional density: the extent to which a policy domain was already structured by entrenched bureaucratic actors and legal-administrative arrangements before security reframing. In the high-density maritime domain, security-related claims were filtered through coordination pressures and incorporated into the BAOP through governance-compatible language, producing layering. In the lower-density space domain, fewer institutional routines existed for absorbing security-related demands within the inherited non-military interpretation of peaceful use, making reinterpretation more consequential and producing conversion. Through comparative process tracing, the article shows that the key variation lies not in the mere presence of security-related concerns, but in the statutory forms they acquire. The article thus qualifies accounts of Japan’s security normalization by showing that it is sectorally and institutionally differentiated.