A child stroller apparatus comprising: a first and a second leg frame (102, 104), and a first and a second seat support frame (108, 110), the first seat support frame being pivotally coupled to the first leg frame and the second seat support frame being pivotally coupled to the second leg frame, the first and second seat support frames (108, 110) further being pivotally coupled to each other, whereby the child stroller apparatus has a foldable frame structure, wherein the first seat support frame includes a seat portion, and the second seat support frame includes a side segment that is pivotally coupled to the seat portion; a locking mechanism operable to lock the child stroller apparatus in an unfolded state, wherein the locking mechanism includes a latch slidably connected with the seat portion, a driving part and a release actuator, the driving part being pivotally connected with the seat portion and connected with the latch, and the release actuator being connected with the driving part and extending above the seat portion, the latch being slidable to an underside of the side segment for locking the child stroller apparatus in the unfolded state and slidable away from the underside of the side segment for folding of the child stroller apparatus, and the release actuator being operable to cause the driving part to rotate so that the driving part urges the latch to slide away from the underside of the side segment; an impeding part movably connected with the seat portion, the impeding part being movable relative to the seat portion between a blocking state and a release state, the impeding part interfering with the locking mechanism in the blocking state to prevent the latch from sliding away from the underside of the side segment, and the impeding part in the release state allowing the latch to slide away from the underside of the side segment for unlocking and folding of the child stroller apparatus; and an actuating part provided on the first seat support frame and exposed above the seat portion, the actuating part being depressible to urge the impeding part to move from the blocking state to the release state; characterized in that: the impeding part is pivotally connected with the seat portion about a pivot axis that extends transversally from a left side to a right side of the seat portion. a first and a second leg frame (102, 104), and a first and a second seat support frame (108, 110), the first seat support frame being pivotally coupled to the first leg frame and the second seat support frame being pivotally coupled to the second leg frame, the first and second seat support frames (108, 110) further being pivotally coupled to each other, whereby the child stroller apparatus has a foldable frame structure, wherein the first seat support frame includes a seat portion, and the second seat support frame includes a side segment that is pivotally coupled to the seat portion; a locking mechanism operable to lock the child stroller apparatus in an unfolded state, wherein the locking mechanism includes a latch slidably connected with the seat portion, a driving part and a release actuator, the driving part being pivotally connected with the seat portion and connected with the latch, and the release actuator being connected with the driving part and extending above the seat portion, the latch being slidable to an underside of the side segment for locking the child stroller apparatus in the unfolded state and slidable away from the underside of the side segment for folding of the child stroller apparatus, and the release actuator being operable to cause the driving part to rotate so that the driving part urges the latch to slide away from the underside of the side segment; an impeding part movably connected with the seat portion, the impeding part being movable relative to the seat portion between a blocking state and a release state, the impeding part interfering with the locking mechanism in the blocking state to prevent the latch from sliding away from the underside of the side segment, and the impeding part in the release state allowing the latch to slide away from the underside of the side segment for unlocking and folding of the child stroller apparatus; and an actuating part provided on the first seat support frame and exposed above the seat portion, the actuating part being depressible to urge the impeding part to move from the blocking state to the release state; characterized in that: the impeding part is pivotally connected with the seat portion about a pivot axis that extends transversally from a left side to a right side of the seat portion.