Door handle device for vehicle and door opening and closing system for vehicle applied therewith

A vehicle door handle device (7) which includes a handle body (11) assembled to a panel of a vehicle door, an operation member (16) provided in the handle body (11) for operating a latch mechanism for switching a latched state and an unlatched state relative to a vehicle body of the vehicle door, and a detection member (15) provided in the handle body (11) for detecting an impact.