A door handle device for a vehicle comprising: a base frame being configured to be attached to a door outer panel of a vehicle door; an outside handle being mounted on the base frame so as to be oscillated between a door closed position and a door opened position, the outside handle extending in an extending direction of the outside handle along an outer surface of a vehicle body; a link mechanism converting a movement of the outside handle in a door opening direction, the movement oscillating from the door closed position to the door opened position, into a movement releasing a retention of the vehicle door in a closed state; and a door opening prevention mechanism preventing the vehicle door from opening by restricting a movement of the link mechanism and by preventing the movement releasing the retention of the vehicle door in the closed state when the vehicle receives an impact; wherein the door opening prevention mechanism includes an inertia lever being rotatably supported at the base frame; an inertia body being mounted to the inertia lever; and an elastic member elastically biasing the inertia lever toward an initial position where the movement of the link mechanism is not restricted by the inertia lever; the inertia lever is retained at the initial position in response to an elastic biasing force of the elastic member in a case where the inertia lever is not applied with an inertia force applied toward an outer side of the vehicle when the vehicle receives an impact; the inertia lever rotates from the initial position to a restriction position where restricting the movement of the link mechanism against the elastic biasing force of the elastic member by using an inertia mass of the inertia body in a case where the inertia lever is applied with the inertia force applied toward the outer side of the vehicle when the vehicle receives an impact and in a case where the inertia force is greater than the elastic biasing force of the elastic member; and the door handle device is characterized in that the inertia lever includes a center of gravity of the inertia lever being set at a same position as a position of a center of gravity of the outside handle in the extending direction of the outside handle, the center of gravity of the inertia lever being set at a same position as a position of the center of gravity of the outside handle in vehicle upper-lower directions, or being set at a lower position relative to the center of gravity of the outside handle. a base frame being configured to be attached to a door outer panel of a vehicle door; an outside handle being mounted on the base frame so as to be oscillated between a door closed position and a door opened position, the outside handle extending in an extending direction of the outside handle along an outer surface of a vehicle body; a link mechanism converting a movement of the outside handle in a door opening direction, the movement oscillating from the door closed position to the door opened position, into a movement releasing a retention of the vehicle door in a closed state; and a door opening prevention mechanism preventing the vehicle door from opening by restricting a movement of the link mechanism and by preventing the movement releasing the retention of the vehicle door in the closed state when the vehicle receives an impact; wherein the door opening prevention mechanism includes an inertia lever being rotatably supported at the base frame; an inertia body being mounted to the inertia lever; and an elastic member elastically biasing the inertia lever toward an initial position where the movement of the link mechanism is not restricted by the inertia lever; the inertia lever is retained at the initial position in response to an elastic biasing force of the elastic member in a case where the inertia lever is not applied with an inertia force applied toward an outer side of the vehicle when the vehicle receives an impact;