The problem of absenteeism is the long standing task by the International Committee on Occupational Health. In Japan it is now also being studied under special Research Committee established for the purpose. 1. Results investigated of absenteeism percentage 2. Difficulties in the preparation of statistics of absenteeism 3. Author's opinions 4. Conclusions The accurate statistics of absenteeism is looked upon as the reflexion of the hygienic conditions in factories and thus most important for industrial hygiene. For the purpose of comparative study among various statistics, it is necessary that some uniform method of compiling the statistical data should be employed not only in one country, but also among all the countries in the world. However, this has been not yet realized. For this purpose, it is hoped that such a form to be used among the nations will be prepared with the cooperation of the colleagues attending this conference.