To provide a novel advertising support medium enabling a quick and highly efficient customization without interfering the play of sports.

This advertising device for sports goals includes a layered or laminated element 2 that is transparent in a vertical position or an inclined position. The layered or laminated element 2 includes lower support media having transparent structure for being disposed at the back of a net 12 of a goal 1; and opaque or semitransparent areas 3 having the same or similar color as the color of the net 12 are found on the layered or the laminated element 2. An operationally appropriate design, sign or logo is formed for creating an optical effect that the opaque or semitransparent areas 3 are incorporated into the net 12 of the goal 1, so as to be appreciated from various points of view.