| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deterioration of the airtightness of a hollow part due to changes of an environmental temperature.SOLUTION: When a cap including a hollow part is sealed to a substrate by a coating resin, a protrusion having a portion, which is larger than the root side, on at least the tip side, is provided at an outer peripheral end part of the cap. The cap and the substrate are placed in close contact with each other while the coating resin is enclosing the protrusion to put the hollow part in the sealing state. |
