Article 67.
The Prime Minister shall be designated from among the members of the Diet by a resolution of the Diet. This designation shall precede all other business.
If the House of Representatives and the House of Councillors disagree and if no agreement can be reached even through a joint committee of both Houses, provided for by law, or the House of Councillors fails to make designation within ten (10) days, exclusive of the period of recess, after the House of Representatives has made designation, the decision of the House of Representatives shall be the decision of the Diet.