A child stroller apparatus comprising: a handle frame having a first side segment fixedly connected with a first coupling part; a front leg frame having a second side segment fixedly connected with a second coupling part; a rear leg frame having a third side segment fixedly connected with a shell, the third side segment being respectively connected pivotally with the first and second coupling parts (41, 44); a linking member received at least partially inside the shell and respectively connected pivotally with the first and second coupling parts (41, 44) about two different pivot axes (B, C), the handle frame and the front leg frame being thereby rotationally linked to each other; a latch disposed adjacent to the first coupling part, the latch being operable to rotationally lock the handle frame with respect to the rear leg frame so as to lock the infant stroller apparatus in an unfolded state, wherein the latch is assembled with the shell and is movable to engage with or disengage from the first coupling part; a release actuator movably assembled with the shell, the latch and the release actuator being in sliding contact with each other via ramp surfaces (45a, 51a), the release actuator being movable upward to cause an unlocking displacement of the latch for disengaging from the first coupling part; and a safety lock mechanism including an impeding part assembled with the release actuator, the impeding part being movable relative to the release actuator to protrude outward and engage with the shell for blocking upward displacement of the release actuator, or to retract inward and disengage from the shell. a handle frame having a first side segment fixedly connected with a first coupling part; a front leg frame having a second side segment fixedly connected with a second coupling part; a rear leg frame having a third side segment fixedly connected with a shell, the third side segment being respectively connected pivotally with the first and second coupling parts (41, 44); a linking member received at least partially inside the shell and respectively connected pivotally with the first and second coupling parts (41, 44) about two different pivot axes (B, C), the handle frame and the front leg frame being thereby rotationally linked to each other; a latch disposed adjacent to the first coupling part, the latch being operable to rotationally lock the handle frame with respect to the rear leg frame so as to lock the infant stroller apparatus in an unfolded state, wherein the latch is assembled with the shell and is movable to engage with or disengage from the first coupling part; a release actuator movably assembled with the shell, the latch and the release actuator being in sliding contact with each other via ramp surfaces (45a, 51a), the release actuator being movable upward to cause an unlocking displacement of the latch for disengaging from the first coupling part; and a safety lock mechanism including an impeding part assembled with the release actuator, the impeding part being movable relative to the release actuator to protrude outward and engage with the shell for blocking upward displacement of the release actuator, or to retract inward and disengage from the shell.