A travel control method for a vehicle, comprising providing a system trigger mode and a driver trigger mode, the system trigger mode including: when a start condition for an automated lane change function of performing a lane change of a vehicle by autonomous travel control is satisfied, presenting lane change information as to whether or not to accept execution of the automated lane change function; when an acceptance input of accepting the execution of the automated lane change function is detected in response to presentation of the lane change information, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the driver trigger mode including: when a predetermined lane change instruction operation is performed, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the method characterized in that, a time for determining whether or not the lane change is possible by the driver trigger mode is set shorter than a time for determining whether or not the lane change is possible by the system trigger mode. providing a system trigger mode and a driver trigger mode, the system trigger mode including: when a start condition for an automated lane change function of performing a lane change of a vehicle by autonomous travel control is satisfied, presenting lane change information as to whether or not to accept execution of the automated lane change function; when an acceptance input of accepting the execution of the automated lane change function is detected in response to presentation of the lane change information, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the driver trigger mode including: when a predetermined lane change instruction operation is performed, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the method characterized in that, the system trigger mode including: when a start condition for an automated lane change function of performing a lane change of a vehicle by autonomous travel control is satisfied, presenting lane change information as to whether or not to accept execution of the automated lane change function; when an acceptance input of accepting the execution of the automated lane change function is detected in response to presentation of the lane change information, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the driver trigger mode including: when a predetermined lane change instruction operation is performed, determining whether or not the lane change is possible; and when determining that the lane change is possible, executing the automated lane change function, the method characterized in that, a time for determining whether or not the lane change is possible by the driver trigger mode is set shorter than a time for determining whether or not the lane change is possible by the system trigger mode.