To provide a shoulder strap attachment allowing the improvement of the durability of connectors, and to provide a backpack including the same.

A shoulder strap attachment 100 for attaching shoulder straps B to a back pad part T of a backpack includes: an attachment plate 1 attachable to the back pad part T of the backpack; and a pair of connectors 3 capable of being connected with upper end parts of the shoulder straps B, swingably attached to the attachment plate 1, and connecting the shoulder straps B to the back pad part T. Each of the pair of connectors 3 has a reinforcing member 11 thereinside.