Except in cases provided by law, members of both Houses shall be exempt from apprehension while the Diet is in session, and any members apprehended before the opening of the session shall be freed during the term of the session upon demand of the House.
両議院の議員は、法律の定める場合を除いては、国会の会期中逮捕されず、会期前に逮捕された議員は、その議院の要求があれば、会期中これを釈放しなければならない。
the Diet
国会
Japan's parliament, and under Article 41 the only body that can make an Act (法律). It has two chambers, the House of Representatives and the House of Councillors, both made up of elected members (Articles 42 and 43). It designates the Prime Minister, approves the budget and treaties, and can start the process of amending the Constitution. A Cabinet Order (政令) or Ministerial Order (省令) may impose a duty or a penalty only where an Act the Diet passed says it may.
Written by AI using Constitution, Arts. 41, 42, 43 and Wikipedia: National Diet as a reference.