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.