A child stroller apparatus comprising: a stroller frame ; a stroller seat supportable by the stroller frame , wherein the stroller seat includes: a backrest portion fixedly connected with a first joining part ; a seat portion fixedly connected with a second joining part that is pivotally connected with the first joining part ; a coupling part pivotally connected with the second joining part , the coupling part being adapted to connect with the stroller frame ; a latch carried with the second joining part and movable between a locking position where the latch is engaged with the coupling part to prevent rotation of the seat portion relative to the coupling part , and an unlocking position where the latch is disengaged from the coupling part for rotation of the seat portion relative to the coupling part ; and a linking mechanism configured to movably couple the latch to the first joining part so that a rotation of the backrest portion relative to the seat portion in a folding direction causes the latch to disengage from the coupling part , and a rotation of the backrest portion relative to the seat portion in an unfolding direction causes the latch to engage with the coupling part ; characterized in that : the linking mechanism includes a driving part carried with the second joining part , the driving part being connected with the latch and movably linked to the first joining part . a stroller frame ; a stroller seat supportable by the stroller frame , wherein the stroller seat includes: a backrest portion fixedly connected with a first joining part ; a seat portion fixedly connected with a second joining part that is pivotally connected with the first joining part ; a coupling part pivotally connected with the second joining part , the coupling part being adapted to connect with the stroller frame ; a latch carried with the second joining part and movable between a locking position where the latch is engaged with the coupling part to prevent rotation of the seat portion relative to the coupling part , and an unlocking position where the latch is disengaged from the coupling part for rotation of the seat portion relative to the coupling part ; and a linking mechanism configured to movably couple the latch to the first joining part so that a rotation of the backrest portion relative to the seat portion in a folding direction causes the latch to disengage from the coupling part , and a rotation of the backrest portion relative to the seat portion in an unfolding direction causes the latch to engage with the coupling part ; a backrest portion fixedly connected with a first joining part ; a seat portion fixedly connected with a second joining part that is pivotally connected with the first joining part ; a coupling part pivotally connected with the second joining part , the coupling part being adapted to connect with the stroller frame ; a latch carried with the second joining part and movable between a locking position where the latch is engaged with the coupling part to prevent rotation of the seat portion relative to the coupling part , and an unlocking position where the latch is disengaged from the coupling part for rotation of the seat portion relative to the coupling part ; and a linking mechanism configured to movably couple the latch to the first joining part so that a rotation of the backrest portion relative to the seat portion in a folding direction causes the latch to disengage from the coupling part , and a rotation of the backrest portion relative to the seat portion in an unfolding direction causes the latch to engage with the coupling part ; characterized in that : the linking mechanism includes a driving part carried with the second joining part , the driving part being connected with the latch and movably linked to the first joining part . <EOS>