To provide a method and device for securely fixing a golf bag on a golf car.

A mechanism and method for securely fixing the golf bag 14 on the golf car includes a first attachment member 12 provided at the golf bag 14. The golf car is provided with a second attachment member 22. An engagement surface of the second attachment member 22 surely meshes with an engagement surface of the first attachment member 12 so as to complement each other. One of the first attachment member 12 and the second attachment member 22 composes a male insertion portion, and the other attachment member composes a female reception portion. When the golf bag 14 is moved in a linear direction to the golf car, the first attachment member 12 and the second attachment member 22 cooperate and engages with each other.