A driving assist method that includes a vehicle speed/headway control function and a lane-keeping function as driving assist functions to assist driving operations by a driver, and that uses a mode transition controller for transitioning between driving assist modes, characterized in that: the driving assist method includes, as the driving assist modes, a hands-off mode in which the driver is allowed to take their hands off a steering wheel, a hands-on mode that includes as a condition that the driver has their hands on the steering wheel, a steering wheel operation mode that encourages the driver to perform steering wheel operations, and a steering wheel assist deactivation mode in which the lane-keeping function is deactivated; acquiring information on a lane disappearance region in which steering wheel assist is to be deactivated during lane-keeping travel in which the hands-off mode has been selected, the lane disappearance region existing along an extension of a travel route of a host vehicle, the lane disappearance region being a region in which no lane continuing from a current lane can be recognized; acquiring information on a lane disappearance start point upon acquiring the information on the lane disappearance region; requesting a mode transition from the hands-off mode to the hands-on mode based on the information on the lane disappearance region; determining whether or not the driver has their hands on the steering wheel after the mode transition to the hands-on mode has been requested; requesting a mode transition from the hands-on mode to the steering wheel operation mode on the condition that it is confirmed that the driver has their hands on the steering wheel; determining whether or not the driver has performed a steering wheel operation after the mode transition to the steering wheel operation mode has been requested; and performing a mode transition from the steering wheel operation mode to the steering wheel assist deactivation mode on the condition that a steering wheel operation by the driver is confirmed before the host vehicle reaches the lane disappearance start point of the lane disappearance region. the driving assist method includes, as the driving assist modes, a hands-off mode in which the driver is allowed to take their hands off a steering wheel, a hands-on mode that includes as a condition that the driver has their hands on the steering wheel, a steering wheel operation mode that encourages the driver to perform steering wheel operations, and a steering wheel assist deactivation mode in which the lane-keeping function is deactivated; acquiring information on a lane disappearance region in which steering wheel assist is to be deactivated during lane-keeping travel in which the hands-off mode has been selected, the lane disappearance region existing along an extension of a travel route of a host vehicle, the lane disappearance region being a region in which no lane continuing from a current lane can be recognized; acquiring information on a lane disappearance start point upon acquiring the information on the lane disappearance region; requesting a mode transition from the hands-off mode to the hands-on mode based on the information on the lane disappearance region; determining whether or not the driver has their hands on the steering wheel after the mode transition to the hands-on mode has been requested; requesting a mode transition from the hands-on mode to the steering wheel operation mode on the condition that it is confirmed that the driver has their hands on the steering wheel; determining whether or not the driver has performed a steering wheel operation after the mode transition to the steering wheel operation mode has been requested; and performing a mode transition from the steering wheel operation mode to the steering wheel assist deactivation mode on the condition that a steering wheel operation by the driver is confirmed before the host vehicle reaches the lane disappearance start point of the lane disappearance region.