Abstract: A vehicle door lock system is applied to a vehicle including a vehicle body having a door opening and a door, and the vehicle door lock system includes a striker structure installed at one of the vehicle body and the door and a door lock device installed at the other of the vehicle body and the door, the striker structure includes a first engagement portion and a second engagement portion disposed away from each other in the width direction, the door lock device includes a hook that is displaced between a locking position where the hook is allowed to be locked to the first engagement portion and a retraction position where the hook is not allowed to be locked to the first engagement portion, and the hook is positioned between the first engagement portion and the second engagement portion in the width direction when positioned at the locking position.

Abstract: A vehicle door lock device includes a latch configured to rotate between a fully-latched position and an unlatched position, a pawl configured to rotate between a restriction position where a rotation of the latch from the fully-latched position to the unlatched position is restricted and a permission position where the rotation is permitted, a latch support shaft, a pawl support shaft, a first base to which a first end of the latch support shaft and a first end of the pawl support shaft are fixed, a second base to which a second end of the latch support shaft and a second end of the pawl support shaft are fixed, and a coupling member that couples the first base and the second base. A first end of the coupling member is fixed to the first base, and a second end of the coupling member is fixed to the second base.

Abstract: A vehicle lower striker structure is disposed below a door opening portion opened and closed by a vehicle door. The vehicle lower striker structure includes: a base plate that has a plate shape whose plate thickness direction is an upper-lower direction, the base plate having a slit extending in a direction intersecting with the plate thickness direction; and a striker shaft that has a rod shape whose longitudinal direction is a direction intersecting the upper-lower direction, the striker shaft being fixed to the base plate and straddling the slit.