Abstract: The optical disk player is capable of preventing vibrations of an optical disk and highly improving reliability of reading and/or writing data. The optical disk player, which is capable of writing data to and/or reading data from the optical disk, comprises: a tray having a mount section, in which the optical disk is mounted; and a top case covering over the mount section of the tray, the top case having a top plate, whose inner face is opposite to the optical disk, and a projected section, which is projected from the inner face of the top plate toward the optical disk.

Abstract: The clearance adjusting screw is capable of precisely adjusting a clearance between a first body and a second body. In the clearance adjusting screw, a first male screw section is capable of screwing with a first female screw section of the first body. A second male screw section is capable of screwing with a second female screw section of the second body. The first male screw section and the second male screw section are coaxially formed, and one of the male screw sections is a right-hand screw, and the other male screw section is a left-hand screw.