A door handle device for a vehicle, comprising: a frame member configured to be mounted to a door outer panel from an inner side of the vehicle, the door outer panel configuring an outer surface of a vehicle door; an outside handle being formed in an elongated shape, the outside handle including a first end and a second end; and a seal member (140, 150) being made from an elastic material; wherein the frame member includes a frame-side stopper; the outside handle includes a handle shaft portion being provided at a portion positioned at the first end, the handle shaft portion serving as a pivot center of the outside handle, the outside handle including an engagement leg portion being provided at a portion positioned at the second end, the engagement leg portion including a handle-side stopper; the handle shaft portion is mounted to the frame member via a first opening portion being formed at the door outer panel; the engagement leg portion is mounted to the frame member via a second opening portion being formed at the door outer panel; the outside handle pivoting about the handle shaft portion between an initial position and a full stroke position; the outside handle being prevented from pivoting in a direction opposite to the initial position by an engagement of the handle-side stopper and the frame-side stopper of the frame member in a case where the outside handle is positioned at the full stroke position; the seal member includes a body portion being configured to be provided at the opening portion of the door outer panel, the body portion sealing the outside handle and the door outer panel, the seal member including an extending portion (153, 253) extending from the body portion to a first region, where the frame-side stopper and the handle-side stopper face with each other; the extending portion (153, 253) includes a first buffer piece (154, 254); and the frame-side stopper is configured to receive an impact generated in response to a pivot of the outside handle about the handle shaft portion to the full stroke position via the first buffer piece (154, 254) of the extending portion (153, 253) of the seal member, the first buffer piece (154, 254) being positioned at the first region. a frame member configured to be mounted to a door outer panel from an inner side of the vehicle, the door outer panel configuring an outer surface of a vehicle door; an outside handle being formed in an elongated shape, the outside handle including a first end and a second end; and a seal member (140, 150) being made from an elastic material; the frame member includes a frame-side stopper; the outside handle includes a handle shaft portion being provided at a portion positioned at the first end, the handle shaft portion serving as a pivot center of the outside handle, the outside handle including an engagement leg portion being provided at a portion positioned at the second end, the engagement leg portion including a handle-side stopper; the handle shaft portion is mounted to the frame member via a first opening portion being formed at the door outer panel; the engagement leg portion is mounted to the frame member via a second opening portion being formed at the door outer panel; the outside handle pivoting about the handle shaft portion between an initial position and a full stroke position; the outside handle being prevented from pivoting in a direction opposite to the initial position by an engagement of the handle-side stopper and the frame-side stopper of the frame member in a case where the outside handle is positioned at the full stroke position; the seal member includes a body portion being configured to be provided at the opening portion of the door outer panel, the body portion sealing the outside handle and the door outer panel, the seal member including an extending portion (153, 253) extending from the body portion to a first region, where the frame-side stopper and the handle-side stopper face with each other; the extending portion (153, 253) includes a first buffer piece (154, 254); and the frame-side stopper is configured to receive an impact generated in response to a pivot of the outside handle about the handle shaft portion to the full stroke position via the first buffer piece (154, 254) of the extending portion (153, 253) of the seal member, the first buffer piece (154, 254) being positioned at the first region.