We investigate if Subordinated Note and Debenture (SND) holders make banks to take less risk by analyzing balance sheet data of Japanese commercial banks. The cross-section regression shows that banks take less risk as the amount of SNDs increase. Specifically, it is shown that the loan risk measure (the ratio of impaired loans to the total loans) and the stock investment risk measure (the invested stocks over bank capital) have decreased with the increase of SND amounts. These results provide evidence that SNDs are effective instrument for the market discipline.