A door system for a vehicle, comprising: a door latch device, including: a meshing mechanism (7,8) configured to be meshable with a striker when a door is closed; a locking/unlocking mechanism (18,19,20) configured to be movable to an unlock position where an opening operation of an operation handle (IH;OH) provided at the door is enabled and where meshing of the meshing mechanism (7,8) is releasable, and to be movable to a lock position where the opening operation of the operation handle (IH;OH) provided at the door is disabled and where meshing of the meshing mechanism (7,8) is unreleasable; a smart lever; and a smart lever detection switch configured to be detectable an operation of the smart lever; wherein the door system further comprises: a window regulator configured to be capable of opening and closing a glass window provided at the door using power of an electric driving source; and a control circuit device configured to control drive of the electric driving source, characterized in that: the smart lever is configured to be operable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the unlock position, and to be inoperable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the lock position; the door system further comprising a door open/close detection switch configured to be detectable closing of a door, wherein the control circuit device performs opening drive control of the electric driving source for a predetermined time, triggered by detection of operation of the smart lever by the smart lever detection switch when the door open/close detection switch is detecting the closing of the door, and performs closing drive control of the electric driving source triggered by detection of closing of the door by the door open/close detection switch. a door latch device, including: a meshing mechanism (7,8) configured to be meshable with a striker when a door is closed; a locking/unlocking mechanism (18,19,20) configured to be movable to an unlock position where an opening operation of an operation handle (IH;OH) provided at the door is enabled and where meshing of the meshing mechanism (7,8) is releasable, and to be movable to a lock position where the opening operation of the operation handle (IH;OH) provided at the door is disabled and where meshing of the meshing mechanism (7,8) is unreleasable; a smart lever; and a smart lever detection switch configured to be detectable an operation of the smart lever; a meshing mechanism (7,8) configured to be meshable with a striker when a door is closed; a locking/unlocking mechanism (18,19,20) configured to be movable to an unlock position where an opening operation of an operation handle (IH;OH) provided at the door is enabled and where meshing of the meshing mechanism (7,8) is releasable, and to be movable to a lock position where the opening operation of the operation handle (IH;OH) provided at the door is disabled and where meshing of the meshing mechanism (7,8) is unreleasable; a smart lever; and a smart lever detection switch configured to be detectable an operation of the smart lever; wherein the door system further comprises: a window regulator configured to be capable of opening and closing a glass window provided at the door using power of an electric driving source; and a control circuit device configured to control drive of the electric driving source, a window regulator configured to be capable of opening and closing a glass window provided at the door using power of an electric driving source; and a control circuit device configured to control drive of the electric driving source, characterized in that: the smart lever is configured to be operable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the unlock position, and to be inoperable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the lock position; the door system further comprising a door open/close detection switch configured to be detectable closing of a door, wherein the control circuit device performs opening drive control of the electric driving source for a predetermined time, triggered by detection of operation of the smart lever by the smart lever detection switch when the door open/close detection switch is detecting the closing of the door, and performs closing drive control of the electric driving source triggered by detection of closing of the door by the door open/close detection switch. the smart lever is configured to be operable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the unlock position, and to be inoperable in linking with the opening operation of the operation handle (IH; OH) when the locking/unlocking mechanism (18, 19, 20) is in the lock position; the door system further comprising a door open/close detection switch configured to be detectable closing of a door, wherein the control circuit device performs opening drive control of the electric driving source for a predetermined time, triggered by detection of operation of the smart lever by the smart lever detection switch when the door open/close detection switch is detecting the closing of the door, and performs closing drive control of the electric driving source triggered by detection of closing of the door by the door open/close detection switch.