The ongoing coronavirus disease 2019 (COVID-19) pandemic has substantially affected patients with dementia and their caregivers . However, we found not all Alzheimer's disease (AD) patients were afraid of COVID-19 infection . Therefore, we investigated the association between rate of awareness of COVID-19 and depressive tendency in AD . 126 consecutive outpatients with AD were enrolled in this study from May 25, on the day when the declaration of emergency was lifted in Japan, through June 30 , 2020 . In addition to routine psychological tests, the participants were asked the following two questions:``Do you know COVID-19?"and``Why are you wearing a face mask?". Moderate to severe AD patients were found to have a low COVID-19 recognition rate and did not fully understand why they were wearing face masks . In addition, because they did not understand the seriousness of the COVID-19 outbreak, their Geriatric Depression Scale scores were also substantially lower . These results may appear to simply indicate that people with severe dementia are unaware of current events . However, these results provide insights into how to care for patients with dementia and how to allocate the time and support of our limited staff during the COVID-19 outbreak.