Proposed is a baby carriage having improved convenience of use, the baby carriage including a main frame, a seat frame, a storage basket, and a wheel unit, wherein the baby carriage is generally used as a single baby carriage and a seat is detachably coupled to the rear of the single baby carriage such that the single baby carriage is utilized as a twin baby carriage when a second baby is born, and wherein it is possible to carry a pet in the baby carriage irrespective of carrying a baby or an infant in the baby carriage, whereby the baby carriage is used in various forms depending on circumstances of a user or a home.