Provided is a baby carriage having improved convenience of use configured to have a structure in which a baby carriage frame and a wagon frame are detachably coupled to a single baby transportation means frame such that the baby carriage frame and the wagon frame are optionally coupled to the left side and the right side of a single frame, in which the compatibility of the frame is excellent through the detachable coupling of a baby carriage seat and a wagon seat, whereby the baby carriage can be used without replacement during growth from a baby to a child, and in which it is possible for a single caregiver to operate the baby carriage in the state of carrying a maximum of four children using a single frame.