Optical semiconductor apparatus

An optical semiconductor apparatus, comprising:

• a substrate;
• an optical semiconductor device placed on an upper surface of the substrate;
• a frame body disposed on the upper surface of the substrate to surround the optical semiconductor device;
• a lid body bonded to an upper surface of the frame body, the lid body having an opening at a position vertically overlapping with the optical semiconductor device;
• and
• a light-transmissive member bonded to an upper surface of the lid body to cover the opening,
• the lid body having a first portion which is positioned to surround the opening and has an upper surface to which the light-transmissive member is bonded, a second portion which is positioned to surround the first portion, and a third portion which is positioned to surround the second portion and has a lower surface to which the frame body is bonded, and
• the upper surface of the first portion being positioned lower than an upper surface of the third portion, and the second portion having a thin-walled portion positioned to surround the first portion, the thin-walled portion having a thickness thinner than a thickness of the first portion as well as thinner than a thickness of the third portion.