Patent ID: 7286729

Claim:
An optical device cavity structure which receives an optical element chip thereon and which is to be mounted on a wiring substrate, the optical device cavity structure comprising: at least two insulator layers, including a first and a second insulator layer, and at least two metal layers, including a first and a second metal layer, alternately layered on one another; a first terminal section formed on a mounting surface to be mounted on the wiring substrate so as to be electrically connected to the wiring substrate; a cavity portion having a generally rectangular opening in a central portion of a surface opposite to the mounting surface; and a light-transmitting member placement section formed on the opposite surface surrounding the opening for receiving a light-transmitting member thereon, wherein the light-transmitting member is for transmitting therethrough light to be received by, or light emitted from, the optical element chip, wherein: a bottom surface of the cavity portion is a portion of the first metal layer and is a chip placement section for receiving the optical element chip thereon; each inner wall surface of the cavity portion is formed by the first insulator layer, the second metal layer and the second insulator layer, which are layered in this order from the bottom surface toward the opening, with a plurality of protruding portions protruding from the inner wall surface, each protruding portion being formed by the first insulator layer and the second metal layer; the second metal layer in each protruding portion is a second terminal section which is electrically connected to the first terminal section and which is to be electrically connected to the optical element chip; and the light-transmitting member placement section includes securing means, being a portion of the second insulator layer, for securing the light-transmitting member.