noun
system of government; government structure
Refers to the overall framework of governance, including institutions, laws, and administrative bodies.
この国の統治機構は複雑で、三権分立が明確ではない。
This country's system of government is complex, and the separation of powers is not clear.
新しい憲法のもとで統治機構が大きく変わった。
Under the new constitution, the government structure changed significantly.
政治体制 refers more to the political regime or system (e.g., democracy, dictatorship), while 統治機構 emphasizes the institutional and structural aspects of governance.
Compound of 統治 (governance, rule) and 機構 (mechanism, structure). The exact historical derivation is uncertain, but the term is used in modern political and legal contexts.