We investigate the change of the management of treated hypertensive patients with or without diabetes in Japan using the data in 2003 and the data in 2005-2006. Physicians treated hypertensive patients more aggressively and evaluated their patients' blood pressure (BP) control more strictly in 2005-2006 than in 2003. However, physicians' assessment of BP control might be still insufficient and the BP control status of patients with diabetes was still poorer than that of non-diabetes patients even in 2005-2006. Further investigation for the change of the management of treated hypertensive patients in Japan is needed.