PURPOSE: To obtain a temperature sensing element which has the excellent vibration resistance with no disconnection, by connecting previously a trunk line having a large section area to a thermoresistance line and welding the trunk line and a supporting conductor together after storing the thermoresistance line into a metallic sheath.

CONSTITUTION: A trunk line 12 having a larger section area than a thermoresistance line is previously connected to both ends of the thermoresistance line wound around a core. The core is stored in a cavity part 10 formed to an inorganic insulator 9 within a metallic pipe 7. Then tne line 12 is welded with a supporting conductor 8. In such way, the line 12 can be connected easily to the supporter 8 even at the outside of the pipe 7 to realize an assured connection between the resistance line and the conductor 8.