Abstract: An object is to prevent a disk substrate from warping to thereby improve the quality of the disk substrate. A disk molding mold includes a first support plate; a first mirror surface disk attached to the first support plate; a second support plate; and a second mirror surface disk attached to the second support plate and facing the first mirror surface disk. At least one of the first and second mirror surface disks comprises a first plate, and a second plate disposed to surround at least a front surface of the first plate. The first plate comprises a temperature control flow passage (93, 94) formed on a surface thereof facing the first support plate. The second plate comprises a heat insulation section formed on a surface thereof facing the first plate such that the heat insulation section corresponds to the temperature control flow passage (93, 94). Since the distribution of heat in the first and second plates is made uniform, a molding material within a cavity can be cooled uniformly.

Abstract: A photodetector including a reception portion and a shield casing for performing electromagnetic shielding of the reception portion, in which a light receiving window confronting the reception portion is formed on the shield casing convexly in a direction away from the reception portion and a plurality of holes for directing light signals towards the reception portion are formed on a peripheral surface of the light receiving window.