Background and Purpose: Our aim was to clarify the cliniciansʼ attitudes and medical trends in patients with cancer and stroke at stroke medical facilities and cancer medical facilities nationwide by a questionnaire survey. Method: A nationwide web questionnaire survey was conducted at primary stroke centers (stroke side, 974 facilities), designated cancer hospitals and Japanese Society of Medical Oncology facilities (cancer side, 584 facilities). Results: The response rate was 54.9% (535/974) on the stroke side and 18.8% (110/584) on the cancer side. Most institutions provided medical care for patients with cancer and stroke (95.5% on the stroke side, 93.6% on the cancer side). On the stroke side, 92.9% of the facilities responded that they were promptly consulted when a cancer patient developed acute stroke, and on the cancer side, they promptly contacted the stroke department at all facilities and have them responded immediately. Conclusion: Medical management for patients with cancer and stroke was provided at almost all facilities. Management of patients with cancer and stroke is a complicated issue to be solved by a single clinical department; therefore, the medical cooperation of cancer and stroke clinicians is required.