Patent ID: 8551623

Claim:
An airtightly sealing cap ( 10 ) in an electronic component storing package ( 100 ) including an electronic component storing member ( 20 ) storing an electronic component ( 40 ), comprising: a base ( 1 ); an underlayer ( 2 ) containing Ni formed on the surface of said base; and a brazing filler metal layer ( 6 ) composed of Au and Sn formed on said underlayer with a thickness of not more than 10 μm, wherein the content of Au in said brazing filler metal layer is at least 43 mass % and not more than 64 mass %, said brazing filler metal layer is so formed as not to be bonded to said electronic component, but to be bonded to said electronic component storing member, said brazing filler metal layer is formed by an Au layer and an Sn layer, and a surface of said Sn layer which faces said electronic component storing member is exposed, and said brazing filler metal layer extends over said electronic component within the electronic component storing package.