A prize acquisition game apparatus is provided which does not require the effort of replacing an interchangeable discharging port structure unit but rather has a discharging port the size of which can be easily changed.The prize acquisition game apparatus comprises: operation means which is operated by a player; a prize housing section for housing a plurality of prizes; prize acquiring means for acquiring a said prize; a discharging port which is formed in the prize housing section for discharging the prize from the prize housing section; control means for controlling the prize acquiring means to operate in response to an operation signal from the operation means; a discharged prize receiving section for receiving the prize discharged through the discharging port by the prize acquiring means which operates under the control of the control means; and sliding means for sliding a frame which is provided on the discharging port to change the size of the discharging port according to a distance the frame is slid.