Introduction: Our hospital began a hospital-wide effort to increase incident reporting around 2012. Since then, the number of reports has increased from 1,210 in 2012 to 16,603 in 2021. However, the number of reports from physicians has not been increasing. Although several measures have been taken to address this situation, the effectiveness of such measures is still unclear. In this study, we compared the numbers of reports from physicians in detail to determine potential effective measures.Methods: We examined the numbers of physicians’ incident reports (at Fujita Health University Hospital) from April 2014 to March 2021. We focused on the reporting rate by physicians out of all incident reports, the number of reports by department, and the number of reports per person by department. We also evaluated the effect of measures and events on improving the increase in incident reports. These include a medical accident investigation system started in 2015, a simplified reporting system established in 2016 for easy reporting, complication reporting standards stipulated in 2017, awareness-raising activities at the training and liaison meetings since 2019, reporting by residents mandated in 2020, and detailed case conferences and feedback for each of the other events. The results were also comparatively examined against the results of safety culture surveys conducted by each department during the same period.Results: Physicians’ incident reporting began to increase in 2015, increasing further with the stipulation of reporting standards in 2017. When it became mandatory for residents to report at least 10 cases per year in 2020, reporting by junior residents increased markedly. Each department, including accident investigation in the clinical department, had a tendency to increase by case. Departments with a high number of reports performed better in the safety culture survey. While the number of patient complaints at hospitals has been increasing nationwide, it has been decreasing at our hospital; this is thought to be one of the effects of these measures.Conclusion: Incident reporting is indispensable in fostering a safety culture among physicians. The survey results indicated that in order to increase the number of incident reports as much as possible, it is important to clearly define the items to be reported. Furthermore, the Safety Office should establish a system for each case and develop a remedial action plan.