Japan Macro

18 September 2026 Fixed Income | Japan Macro Information

Implications of cabinet reshuffle and LDP executive appointments for Upper House proceedings and 2027 party leadership election

Yusuke Matsuo Senior Market Economist Prime Minister Sanae Takaichi announced a new executive lineup for the LDP on 16 September ahead of a cabinet reshuffle the next day. Although the Japan Innovation Party (“Ishin”) entered the cabinet, with Hiroshi Nakatsuka appointed minister in charge of regulatory reform, there were few changes to key posts. On the whole, the appointments can be characterized as emphasizing continuity within the administration.

Finance Minister Satsuki Katayama and Minister of State for Economic and Fiscal Policy Minoru Kiuchi, whose fate the market was closely watching, retained their posts. Some were concerned that the retention of Mr. Kiuchi, who was responsible for the Basic Policy on Economic and Fiscal Management and Reform, made it more likely that the administration would continue with its “responsible and proactive fiscal policy,” perceived as being reflationary. The market reaction was subdued, however, perhaps because this outcome was widely anticipated and because it was thought that a substantial policy shift was unlikely even if they were replaced as long as Ms. Takaichi is prime minister.

At her press conference, Ms. Takaichi said the cabinet reshuffle would “accelerate policies aimed at building a strong economy with responsible and proactive fiscal policy,” adding that “we cannot maintain fiscal sustainability without growth.” With respect to the Bank of Japan, which appears almost certain to raise rates today, she noted that the selection of specific monetary policy tools is left to the Bank itself and confined her remarks to saying that she expects it to conduct monetary policy appropriately to achieve its 2% price stability target. Meanwhile, we would like to highlight two aspects of the appointments that appear likely to have some bearing on the political situation going forward.

First, Kazuhiko Aoki was chosen to replace Junichi Ishii as secretary-general of the LDP’s Upper House caucus. The prime minister, who also serves as LDP president, reportedly grew increasingly distrustful of Mr. Ishii after the party failed to push through the FY2026 budget by the end of the fiscal year and was forced to agree to intensive deliberations toward the end of the Diet session (Jiji Press, 15 September). The party’s rules do not allow Ms. Takaichi to intervene directly in Upper House leadership appointments, and on 16 September she said that “I have no authority over these appointments, and I understand that Upper House caucus leader [Masaji] Matsuyama made the decision.” Nevertheless, some reports suggest that Mr. Matsuyama, who effectively controls the appointments, replaced Mr. Ishii in an effort to regain the trust of the Prime Minister’s Office. Those close to Ms. Takaichi reportedly denied involvement, saying “We fully respect the autonomy of the Upper House, and the Prime Minister’s Office made no requests regarding personnel appointments.” Nevertheless, concerns have reportedly emerged within the LDP’s Upper House caucus that “Diet proceedings may no longer run smoothly,” according to a mid- ranking member (Yomiuri, 16 September).

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