A child stroller apparatus comprising: a first leg frame including a first side segment affixed with a first coupling element, a second leg frame including a second side segment affixed with a second coupling element that is pivotally connected with the first coupling element about a first pivot axis, a handle including a third side segment affixed with a third coupling element that is pivotally connected with the first coupling element about a second pivot axis spaced apart from the first pivot axis, and a latch element movable between a locked position and an unlocked position, the latch element when in the locked position locks the first, second and third coupling elements (132, 134, 136) together to hold the handle and the first and second leg frames (110, 112) in a deployed state, and the latch element when in the unlocked position allows rotation of the second leg frame about the first pivot axis relative to the first leg frame and rotation of the handle about the second pivot axis relative to the first leg frame to turn the child stroller apparatus to a collapsed state, characterized in that: the first coupling element includes a first locking groove, and the third coupling element includes a second locking groove, the first and second locking grooves (144, 166) being disposed radially apart from the second pivot axis; and the latch element is movably assembled with the second leg frame, the latch element when in the locked position being engaged with the first and second locking grooves (144, 166), and the latch element when in the unlocked position being disengaged from the first and second locking grooves (144, 166). a first leg frame including a first side segment affixed with a first coupling element, a second leg frame including a second side segment affixed with a second coupling element that is pivotally connected with the first coupling element about a first pivot axis, a handle including a third side segment affixed with a third coupling element that is pivotally connected with the first coupling element about a second pivot axis spaced apart from the first pivot axis, and a latch element movable between a locked position and an unlocked position, the latch element when in the locked position locks the first, second and third coupling elements (132, 134, 136) together to hold the handle and the first and second leg frames (110, 112) in a deployed state, and the latch element when in the unlocked position allows rotation of the second leg frame about the first pivot axis relative to the first leg frame and rotation of the handle about the second pivot axis relative to the first leg frame to turn the child stroller apparatus to a collapsed state, characterized in that: the first coupling element includes a first locking groove, and the third coupling element includes a second locking groove, the first and second locking grooves (144, 166) being disposed radially apart from the second pivot axis; and the latch element is movably assembled with the second leg frame, the latch element when in the locked position being engaged with the first and second locking grooves (144, 166), and the latch element when in the unlocked position being disengaged from the first and second locking grooves (144, 166).