Power of Attorney for Makoto Samejima

This filing is an Exhibit 24, a Power of Attorney granted by Makoto Samejima, Chief Financial Officer of Mizuho Financial Group, Inc., to Yuki Nishii and Yusuke Maruyama. This grants them the authority to execute and deliver forms required by the U.S. Securities and Exchange Commission related to Samejima's ownership or transactions in Mizuho Financial Group, Inc. securities. This includes filings under Section 16(a) of the Securities Exchange Act of 1934 (Forms 3, 4, 5) and Rule 144 of the Securities Act of 1933 (Form 144). The power of attorney remains effective until Samejima is no longer required to file these forms, unless earlier revoked in writing. Samejima acknowledges that Nishii and Maruyama are not assuming his compliance responsibilities.