Knocking detecting sensor

摘要

A knocking detecting sensor for detecting knocking generated in an internal combustion engine includes a vibration detecting element, a terminal, a terminal holder, a casing and a sealing member. The vibration detecting element detects vibrations due to knocking. The terminal having a first and a second ends, the first end being connected to the vibration detecting element so as to take out an output therefrom. The terminal holder integrated with the terminal so as to hold it. The casing houses the vibration detecting element and the terminal holder, the casing having a terminal through-hole for externally protruding the second end of the terminal. The sealing member is arranged so as to surround the terminal between said terminal holder and the casing to prevent fluid from leaking into the inside of the casing from the terminal through-hole. Such a sensor structure assures airtightness of the casing and easiness of wiring the detecting element to the terminal.