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.