To provide such a device that a multi-functional carrying device, which can correspond to human, social and natural environments and which a person can get on or be got on, maintains the function of corresponding to these environments.

An infant carrier 12 of rucksack type is hitched at the handrail 4 and/or hand-push part of a stroller, so-called buggy 16, in such a way as borne by person's back. This is secured by a belt 17 fitted with a buckle for precluding the two pats from being set loose undeliberately or modifying the configuration easily into one-person riding or two-person riding type. To heighten the safety, it is secured by a belt 20 fitted with a buckle for precluding the part 18 with leg of infant carrier 12 of rucksack type from separating or dislocating from the part 19 just over the rear wheels of the buggy 16. Further a stopper is furnished on the side with infant carrier 12 of rucksack type.