Sealing lid formed from translucent material

A sealing lid that is joinable to a package main body containing an optical element and that is for producing a package hermetically sealed, the sealing lid comprising a lid main body comprising a translucent material comprising one of glass, crystal, sapphire, silicon and germanium,

• wherein the package main body consists of a metal or a ceramic,
• wherein the lid main body comprises a joining region having a frame shape corresponding to an outer circumferential shape of the lid main body, the joining region being formed on a surface of the lid main body that is to be joined to the package main body,
• wherein a plurality of pieces of brazing material comprising a eutectic alloy are fused on the joining region of the lid main body, and
• wherein a material structure of a random cross section of the plurality of pieces of brazing material consisting of (a) a eutectic structure and (b) a single phase having an equivalent circle diameter of equal to or less than 5 μm.