LID FOR OPTICAL ELEMENT PACKAGE, OPTICAL ELEMENT PACKAGE, AND MANUFACTURING METHOD FOR LID FOR OPTICAL ELEMENT PACKAGE AND OPTICAL ELEMENT PACKAGE

A lid for an optical element package, comprising: a window material provided in front of the light emitting direction of an optical element of a housing member, inside of which the optical element is housed; and a metal-based adhesive layer formed on a part at which the window material contacts the housing member, wherein with the lid for an optical element package, the metal-based adhesive layer is formed by an adhesive composition including metal nanoparticles, a solder powder, and a dispersion medium coated by a coating agent. It is possible to address deterioration and cracking due to light of short wavelengths, distortion or decay of the adhesive agent due to heat generation of the light emitting element, and the problem of long-term reliability accompanying these. Specifically, it is possible to provide the lid for an optical element package and the optical element package with excellent heat resistance, ultraviolet resistance, etc.