A temperature sensor (1) is configured such that a ring pressure section (21) is fixed to a ring seat face (39b) by screwing a fixing member (25) into a screw attachment member (37) in a state in which the ring pressure section (21) is seated on the ring seat face (39b), and pressing a front-end facing surface (25b) of the fixing member (25) against a rear-end facing surface (21c) of the ring pressure section (21). A dry film (41) containing an organic silicon polymer having a polycarbosilane skeleton that is cross-linked by a metal element and a solid lubricant such as molybdenum disulfide and mica is provided on at least one of the front-end facing surface (25b) of the fixing member (25) and the rear-end facing surface (21c) of the ring pressure section (21).