Abstract: A more thinnable hermetic sealing cap can be provided. This hermetic sealing cap (10) is employed for an electronic component housing package (100) housing an electronic component (40) and includes a cap body portion (1) mainly composed of Ti.

Abstract: A more thinnable hermetic sealing cap can be provided. This hermetic sealing cap (10) is employed for an electronic component housing package (100) housing an electronic component (40) and includes a cap body portion (1) mainly composed of Ti.

Abstract: Cap for airtight sealing (1) that not only suppresses any deterioration of the properties of electronic parts (20) to thereby reduce material costs but also enables use of Pb-free solders, and that is capable of suppressing any airtightness deterioration. This cap for airtight sealing comprises low thermal expansion layer (2); Ni—Co alloy layer (3) superimposed on the surface of the low thermal expansion layer and composed mainly of Ni wherein a diffusion acceleration material is contained; Ni layer (4) superimposed on the surface of the Ni—Co alloy layer; and solder layer (5) superimposed on the surface of the Ni layer at regions for bonding of electronic part accommodation member (10) and composed mainly of Sn. The Ni layer has the functions of not only suppressing any diffusion of the Ni—Co alloy layer into the solder layer at about 235° C. (first temperature) but also at bonding of the solder layer with the electronic part accommodation member at about 300° to about 320° C.