日本参议院选举临近，执政党前景堪忧，日股危了？

Core Viewpoint - The upcoming Japanese Senate election poses significant uncertainty for the ruling coalition, with potential implications for market volatility and stock performance as various polls indicate a risk of losing majority seats [1][2][4]. Group 1: Election Impact on Market - Historical data suggests that when the ruling party loses majority seats in the Senate, the stock market typically declines [2]. - The scale of the ruling coalition's loss will directly influence market reactions, with different scenarios outlined based on the election outcome [9]. - If the ruling coalition maintains its majority, Prime Minister Kishida will continue to govern, but the stability of the House of Representatives remains in question [9]. Group 2: Political Stability Concerns - There is a notable concern regarding the potential resignation of Prime Minister Kishida if the ruling coalition loses its majority, which could lead to a more fluid political situation [4][5]. - The probability of Kishida stepping down by 2025 is perceived as significant, reflecting deep market concerns about political stability [5]. Group 3: Corporate Governance Challenges - The election outcome may challenge corporate governance reforms, as left-wing parties oppose current reforms and right-wing parties call for stricter regulations [10]. - Key issues include proposals for increased taxes on large corporations and high-net-worth individuals, as well as a reevaluation of shareholder-focused governance models [10]. Group 4: Trade Negotiations and Economic Policy - The Senate election results will also impact the ongoing U.S.-Japan tariff negotiations, with the ruling coalition likely to avoid making concessions during the election period [11][12]. - If the ruling coalition remains in power, clarity on tariff negotiations may emerge post-election; however, significant changes in government could delay agreements further [13].