A travel control method for a vehicle, comprising: acquiring left-side travelable road area boundary information regarding a left-side boundary line of a travelable road area in which a subject vehicle can travel and right-side travelable road area boundary information regarding a right-side boundary line of the travelable road area; and generating a potential field in a space of the travelable road area wherein the left-side boundary line of the left-side travelable road area boundary information is set to a first potential value (+P) and the right-side boundary line of the right-side travelable road area boundary information is set to a second potential value (-P) different from the first potential value (+P) in the potential field, characterized in further comprising: calculating potential values of the potential field to calculate a travelable road area width on a basis of the calculated potential values; correcting the first potential value (+P) and/or the second potential value (-P) so that an absolute value of a difference between a lateral position of a travel route set in advance in the travelable road area on a basis of the left-side boundary line or the right-side boundary line and a lateral position of a travel route set on a basis of the calculated travelable road area width is equal to a predetermined value or less; generating a corrected potential field in the space of the travelable road area wherein the left-side boundary line of the left-side travelable road area boundary information is set to a corrected first potential value and the right-side boundary line of the right-side travelable road area boundary information is set to a corrected second potential value in the corrected potential field; generating a travel route in which the subject vehicle travels on a basis of equipotential lines in the generated corrected potential field; and executing autonomous travel control of the subject vehicle according to the generated travel route. acquiring left-side travelable road area boundary information regarding a left-side boundary line of a travelable road area in which a subject vehicle can travel and right-side travelable road area boundary information regarding a right-side boundary line of the travelable road area; and generating a potential field in a space of the travelable road area wherein the left-side boundary line of the left-side travelable road area boundary information is set to a first potential value (+P) and the right-side boundary line of the right-side travelable road area boundary information is set to a second potential value (-P) different from the first potential value (+P) in the potential field, characterized in further comprising: calculating potential values of the potential field to calculate a travelable road area width on a basis of the calculated potential values; correcting the first potential value (+P) and/or the second potential value (-P) so that an absolute value of a difference between a lateral position of a travel route set in advance in the travelable road area on a basis of the left-side boundary line or the right-side boundary line and a lateral position of a travel route set on a basis of the calculated travelable road area width is equal to a predetermined value or less; generating a corrected potential field in the space of the travelable road area wherein the left-side boundary line of the left-side travelable road area boundary information is set to a corrected first potential value and the right-side boundary line of the right-side travelable road area boundary information is set to a corrected second potential value in the corrected potential field; generating a travel route in which the subject vehicle travels on a basis of equipotential lines in the generated corrected potential field; and executing autonomous travel control of the subject vehicle according to the generated travel route. calculating potential values of the potential field to calculate a travelable road area width on a basis of the calculated potential values; correcting the first potential value (+P) and/or the second potential value (-P) so that an absolute value of a difference between a lateral position of a travel route set in advance in the travelable road area on a basis of the left-side boundary line or the right-side boundary line and a lateral position of a travel route set on a basis of the calculated travelable road area width is equal to a predetermined value or less; generating a corrected potential field in the space of the travelable road area wherein the left-side boundary line of the left-side travelable road area boundary information is set to a corrected first potential value and the right-side boundary line of the right-side travelable road area boundary information is set to a corrected second potential value in the corrected potential field; generating a travel route in which the subject vehicle travels on a basis of equipotential lines in the generated corrected potential field; and executing autonomous travel control of the subject vehicle according to the generated travel route.