Storage part structure for saddle type vehicle

In a storage part structure for a saddle type vehicle including a storage box and a battery box, the invention aims to make it possible to detach a battery box easily and enhance maintainability. According to the invention, the storage part structure for the saddle type vehicle includes the storage box (80), and the battery box (77) formed as a body separate from the storage box (80) and fixed to the storage box (80). In the storage part structure, the battery box (77) is disposed under the storage box (80), a horizontal part cross member (18) constituting a body frame (F) is disposed under the battery box (77), and the battery box (77) is mounted on the horizontal part cross member (18).