A driver abnormality detection device detects an abnormality in a driver of a vehicle. A first notification is performed in response to detecting the abnormality. It is determined whether a first input by the driver has been detected in a first input period set after a start of the first notification. A second notification is performed in response to determining that the first input has been detected in the first input period. It is determined whether a second input by the driver has been detected in a second input period set after a start of the second notification. A first abnormality condition process is executed in response to determining that the first input has not been detected in the first input period. A second abnormality condition process is executed in response to determining that the second input has not been detected in the second input period.