To provide a baby carriage cover capable of preventing any uncomfortable atmosphere from staying, and ensuring the atmosphere, temperature and humidity suitable for breeding a baby and for the health.

Either or each of an upper closed sheet 4a and a lower closed sheet 4b of a closed sheet 4 mounted so as to close a substantially upper half and a substantially lower half of a mesh 3d formed on the entire surface on both sides of a baby carriage cover 1 is opened to change the air inside the baby carriage cover 1 with the fresh outside air via a substantially half surface or the substantially entire surface of the mesh 3d. The entire surface of the mesh 3d is closed to prevent ingress of any uncomfortable atmosphere for a baby such as wind, air, snow, exhaust gas, humidity and odor, and the baby is protected from the external factors caused by the atmosphere or the like.