The use of International Financial Reporting Standards (IFRS) in preparing financial statements is mandatory for companies listed in European stock markets since 2005. It is increasingly important to understand the effect of IFRS on accounting information quality and then its usefulness for investors. This paper examines the impact of IFRS adoption on earnings quality for a sample of listed companies in a European stock market: The Paris stock exchange. The empirical study is covering the nine-year period from 2002 to 2010. Earnings quality is examined by measuring the strength of the association between earnings and firm market value. Results indicate that accounting information quality has been improved by the increase of the association degree. Earnings measured using IFRS are more useful for firms’ evaluation. This result was less evident during the Global Financial Crisis. Further tests indicate that these results are not significantly sensitive to the firm size. Value relevance of earnings prepared using IFRS is not higher for large companies: SBF80.