A contents reproduction device can concurrently switch a video image and a graphics image from 2D to 3D. A contents reproduction device includes a program execution unit that outputs a graphics image used for 2D to a left graphics plane and outputs a graphics image used for 3D to left and right graphics planes; an AV reproduction unit outputs a video image used for 2D to the left video plane and outputs a video image used for 3D to the left and right video planes; and a switch unit outputs a first synthesized image of images stored at the left video plane and the left graphics plane at the 2D reproduction time and switches to output a second synthesized image of images stored at the right video plane and the right graphics plane and the first synthesized image at the 3D reproduction time.