To provide a cover for a baby carriage staying no atmosphere imparting incomfortability and capable of retaining to an atmosphere, temperature and humidity suitable for growth and health of infants.

Ventilation is carried out by opening a part of closing sheets 4, 4 mounted to the state where the approximately whole surface of meshes 3d, 3d formed on the whole surface of both side parts of the cover 1 for the baby carriage is closed or opening the approximately whole of it. Air at the inside of the cover 1 for the baby carriage and external fresh air are ventilated through a part of the meshes 3d, 3d or the approximately whole of it. It is inhibited that the atmosphere imparting incomfortability to the infants such as wind/rain and snow, exhaust gas, moisture and bad odor is intruded by closing the approximately whole of the meshes 3d, 3d with closing sheets 4, 4. The infants are protected from the external factor by the atmosphere or the like.