To use a shoulder bag as an assisting tool for instantaneously holding an infant as necessary by providing a shoulder bag body for storing goods and a belt to be hung from the shoulder of a human body and providing an infant supporting part to the body or the belt.

In the shoulder bag 1, the belt 4 is fitted to the both left and right ends of an upper part in the shoulder bag body for storing the goods through square connection rings 3 and the length of the belt 4 is freely adjusted by a buckle. Then, a first opening part 6 for putting in and taking out the goods and a second opening part 7 for supporting the infant are formed so as to extend in parallel and first and second fasteners 8 and 9 are respectively arranged in the opening parts 6 and 7. Moreover, the infant supporting part 10 formed in a hammock shape by a net is fixed to the second opening part 7 by a proper means such as sewing. Thus, the bag is instantaneously used as the assisting tool for holding the infant in a stable state as necessary.