A vehicular door handle device mountable on a door of a vehicle for carrying out an opening operation to unlock the door, comprising: a base member fixed to the door of the vehicle; and a handle in which a fulcrum arm connected to a turning fulcrum of the base member is formed on one end of the handle, and a guide arm connected to an operation guide formed on the base member is formed on a free end which is the other end of the handle; wherein: the operation guide is provided with a restriction member which includes a shaft connected to the guide arm of the handle and configured to turn around an axis intersecting with a pull-up direction of the handle when the handle is pulled up, and a pair of lever bodies (15, 16), one of which abuts against a locking part of the guide arm when the handle is pulled up and the other of which stops turning motion of the one lever body in tandem with a lock device; a lock pin hole is formed in the shaft and opens toward the door in a direction intersecting with the axis and in a phase corresponding to an initial opening operation of the handle in which the door is not unlocked; a case body is disposed in the base member so as to face the lock pin hole, and a lock pin is disposed in the case body; the lock pin includes a pin portion which is guided by a pin-guide groove formed in the base member and which is fitted into the lock pin hole, and a base end has a predetermined weight; a spring member biased to a position where the lock pin is disengaged from the lock pin hole is disposed between the pin-guide groove and the base end; when an impact load exceeding a biasing force of the spring member is generated with respect to the door, the pin portion is relatively fitted into the lock pin hole by inertia of the lock pin, and turning motion of the shaft around its axis is restricted to prevent the door from being unlocked; a through hole for operation check of the lock pin is formed in a bottom of the case body, characterised in that a soft body (31, 131) having a size capable of closing the through hole of the bottom is interposed between the bottom and the through hole or the base end; and in that the soft body (31, 131) seals the through hole, and when the lock pin is moved toward the bottom by the spring member, the soft body (31, 131) stops vibration of the lock pin and hammering sound generated by the vibration. a base member fixed to the door of the vehicle; and a handle in which a fulcrum arm connected to a turning fulcrum of the base member is formed on one end of the handle, and a guide arm connected to an operation guide formed on the base member is formed on a free end which is the other end of the handle; the operation guide is provided with a restriction member which includes a shaft connected to the guide arm of the handle and configured to turn around an axis intersecting with a pull-up direction of the handle when the handle is pulled up, and a pair of lever bodies (15, 16), one of which abuts against a locking part of the guide arm when the handle is pulled up and the other of which stops turning motion of the one lever body in tandem with a lock device; a lock pin hole is formed in the shaft and opens toward the door in a direction intersecting with the axis and in a phase corresponding to an initial opening operation of the handle in which the door is not unlocked; a case body is disposed in the base member so as to face the lock pin hole, and a lock pin is disposed in the case body; the lock pin includes a pin portion which is guided by a pin-guide groove formed in the base member and which is fitted into the lock pin hole, and a base end has a predetermined weight; a spring member biased to a position where the lock pin is disengaged from the lock pin hole is disposed between the pin-guide groove and the base end; when an impact load exceeding a biasing force of the spring member is generated with respect to the door, the pin portion is relatively fitted into the lock pin hole by inertia of the lock pin, and turning motion of the shaft around its axis is restricted to prevent the door from being unlocked; a through hole for operation check of the lock pin is formed in a bottom of the case body, characterised in that a soft body (31, 131) having a size capable of closing the through hole of the bottom is interposed between the bottom and the through hole or the base end; and in that the soft body (31, 131) seals the through hole, and when the lock pin is moved toward the bottom by the spring member, the soft body (31, 131) stops vibration of the lock pin and hammering sound generated by the vibration.