A carrier frame comprising: a first tubular member ; a second tubular member pivoted to the first tubular member ; a third tubular member pivoted to the second tubular member to form a pivot portion cooperatively with the first tubular member and the second tubular member ; and a folding unit comprising: a pivot frame hinged to the pivot portion and the second tubular member respectively; a first rod , an end of the first rod being pivoted to the pivot frame at a first pivot point, another end of the first rod being pivoted to the pivot frame at a second pivot point; a linkage rod , an end of the linkage rod being pivoted to the first tubular member , another end of the linkage rod being pivoted to the pivot frame at a third pivot point; and a second rod , an end of the second rod being pivoted to the third tubular member , another end of the second rod being pivoted to the linkage rod at a fourth pivot point, the second pivot point, the third pivot point and the fourth pivot point being located at the same pivot axis; wherein a folding of the first tubular member relative to the third tubular member drives the second rod via the linkage rod to be folded relative to the pivot frame , so as to fold the third tubular member relative to the second tubular member . a first tubular member ; a second tubular member pivoted to the first tubular member ; a third tubular member pivoted to the second tubular member to form a pivot portion cooperatively with the first tubular member and the second tubular member ; and a folding unit comprising: a pivot frame hinged to the pivot portion and the second tubular member respectively; a first rod , an end of the first rod being pivoted to the pivot frame at a first pivot point, another end of the first rod being pivoted to the pivot frame at a second pivot point; a linkage rod , an end of the linkage rod being pivoted to the first tubular member , another end of the linkage rod being pivoted to the pivot frame at a third pivot point; and a second rod , an end of the second rod being pivoted to the third tubular member , another end of the second rod being pivoted to the linkage rod at a fourth pivot point, the second pivot point, the third pivot point and the fourth pivot point being located at the same pivot axis; wherein a folding of the first tubular member relative to the third tubular member drives the second rod via the linkage rod to be folded relative to the pivot frame , so as to fold the third tubular member relative to the second tubular member . a pivot frame hinged to the pivot portion and the second tubular member respectively; a first rod , an end of the first rod being pivoted to the pivot frame at a first pivot point, another end of the first rod being pivoted to the pivot frame at a second pivot point; a linkage rod , an end of the linkage rod being pivoted to the first tubular member , another end of the linkage rod being pivoted to the pivot frame at a third pivot point; and a second rod , an end of the second rod being pivoted to the third tubular member , another end of the second rod being pivoted to the linkage rod at a fourth pivot point, the second pivot point, the third pivot point and the fourth pivot point being located at the same pivot axis; wherein a folding of the first tubular member relative to the third tubular member drives the second rod via the linkage rod to be folded relative to the pivot frame , so as to fold the third tubular member relative to the second tubular member . <EOS>