| 摘要 |
PROBLEM TO BE SOLVED: To strongly fix a lower part of an insulating pipe of a plug socket and a lower boot part mounted by being covered on a glass part having a top terminal of an ignition plug without adhering the parts. SOLUTION: Annular locking parts 26, 26' are provided on an outer periphery of a lower part of the insulating pipe 24 of the plug socket 20. Annular receiving recessed parts 28, 28' for receiving the locking parts 26, 26' of the lower part of the insulating pipe 24 are provided at the inside of the lower boot part 23. Annular thick thickened parts 29, 29' to be compressed on an inner periphery of a plug hole are provided around the locking parts 26, 26' of the insulating pipe 24 received by the receiving recessed parts 28, 28' on an outer periphery of the lower boot.
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