Disclosed is an output buffer circuit provided with a pre-emphasis function, including a first buffer circuit, receiving a first logic signal to drive a transmission line, and a second buffer circuit. An optical disc 102 includes, from the bottom of the drawing: a substrate 104; a first information recording layer 108 formed on the substrate 104; and a first light transmission layer 110 having a thickness of about 20 \u03bcm formed on the first information recording layer 108. The underlying cushion has a spring-like connection with the base wall.