1. An optical disc comprises a first information storing layer (13, 23, 43, 62) for reflecting a first laser beam and for transmitting a second laser beam, the wavelength of said second laser beam being shorter than the wavelength of said first laser beam, the information stored in said first information storing layer (13, 23, 43, 62) being read-out by said first laser beam, a second information storing layer (12, 22, 42, 63) for reflecting said second laser beam transmitted through said first information storing layer (13, 23, 43, 62), the information stored in said second information storing layer (12, 22, 42, 63) being read-out by said second laser beam, and a light incidence surface into which first and second laser beams are irradiated for reading-out the information from said first and second information storing layers (13, 23, 43, 62; 12, 22, 42, 63) respectively, said light incidence surface being formed at one side of said optical disc. The first information storing layer (13, 23, 43, 62) and the second information storing layer (12, 22, 42, 63) are provided to be optically separated for separating the reflected laser beam reflected by said first information storing layer (13, 23, 43, 62) and the reflected laser beam reflected by said second information storing layer (12, 22, 42, 63), and the length between said light incidence surface to said second information storing layer is substantially equal to the thickness of said optical disc.