A baby buggy comprising a foldable frame, a locking device for locking said frame, wheel assemblies disposed at the bottom of the frame, and a seat set on the frame, wherein the frame comprises: a front wheel bracket having front wheel rods (10,20) extending along an anteroposterior direction; a right rear wheel bracket, which is rotatably connected at its upper portion to a rear portion of the front wheel bracket by a first axis of rotation; a left rear wheel bracket, which is rotatably connected at its upper portion to the rear portion of the front wheel bracket by a second axis of rotation; a right push rod; a left push rod; a right rear supporting rod, which is rotatably connected at its upper portion to the right push rod by a seventh axis of rotation, and rotatably connected at its lower portion to the rear portion of the front wheel bracket by a third axis of rotation; a left rear supporting rod, which is rotatably connected at its upper portion to the left push rod by an eighth axis of rotation, and rotatably connected at its lower portion to the rear portion of the front wheel bracket by a fourth axis of rotation; a first driving rod, which is rotatably connected at its upper portion to a lower portion of the right push rod by a ninth axis of rotation, and rotatably connected at its lower portion to the left rear wheel bracket by a twelfth axis of rotation; and a second driving rod which is rotatably connected at its upper portion to a lower portion of the left push rod by a tenth axis of rotation, and rotatably connected at its lower portion to the right rear wheel bracket by an eleventh axis of rotation, wherein a sliding part is provided which is slidably arranged on the front wheel rods (10,20) along the anteroposterior direction thereof, wherein the first driving rod (12 is rotatably connected to the sliding part by a fifth axis of rotation and wherein the second driving rod is rotatably connected to the sliding part by a sixth axis of rotation, characterized in that the front wheel rods include: a left front wheel rod positioned at the left side of the front wheel bracket, which is inserted into a left through hole opened at the left side of the sliding part; and a right front wheel rod positioned at the right side of the front wheel bracket, which is inserted into a right through hole opened at the right side of the sliding part. a front wheel bracket having front wheel rods (10,20) extending along an anteroposterior direction; a right rear wheel bracket, which is rotatably connected at its upper portion to a rear portion of the front wheel bracket by a first axis of rotation; a left rear wheel bracket, which is rotatably connected at its upper portion to the rear portion of the front wheel bracket by a second axis of rotation; a right push rod; a left push rod; a right rear supporting rod, which is rotatably connected at its upper portion to the right push rod by a seventh axis of rotation, and rotatably connected at its lower portion to the rear portion of the front wheel bracket by a third axis of rotation; a left rear supporting rod, which is rotatably connected at its upper portion to the left push rod by an eighth axis of rotation, and rotatably connected at its lower portion to the rear portion of the front wheel bracket by a fourth axis of rotation; a first driving rod, which is rotatably connected at its upper portion to a lower portion of the right push rod by a ninth axis of rotation, and rotatably connected at its lower portion to the left rear wheel bracket by a twelfth axis of rotation; and a second driving rod which is rotatably connected at its upper portion to a lower portion of the left push rod by a tenth axis of rotation, and rotatably connected at its lower portion to the right rear wheel bracket by an eleventh axis of rotation, wherein a sliding part is provided which is slidably arranged on the front wheel rods (10,20) along the anteroposterior direction thereof, wherein the first driving rod (12 is rotatably connected to the sliding part by a fifth axis of rotation and wherein the second driving rod is rotatably connected to the sliding part by a sixth axis of rotation, a left front wheel rod positioned at the left side of the front wheel bracket, which is inserted into a left through hole opened at the left side of the sliding part; and a right front wheel rod positioned at the right side of the front wheel bracket, which is inserted into a right through hole opened at the right side of the sliding part.