There is provided a game device that can improve reality of a game field, by causing change in an image for a game field due to various reasons, such as change in viewpoint, with a simple method. With a game device, in display processing executed by a control section (11), rendering control section (13), display storage section (14) and display section (1), a game control section (3) carries out processing of game content performed inside a game field based on player operations, a composition rate change section (33) changes an image composition rate, a display control section (34) generates a composite image combining a plurality of image data based on the image composition rate, and a game field is displayed using the composite image.