This study investigates the impact of investor sentiment on accounting conservatism; previous studies focused on be investigating the association between investor sentiment and disclosure policy. This study is base on those previous studies, examining whether accounting conservatism, which is highly related with disclosure policy, will also be influenced by investor sentiment. This study uses three conservatism measures: market-based measure, and accrual-based measure, and measure of asymmetric timeliness of earnings. This results showed that firms with higher investor sentiment have higher accounting conservatism.