A temperature sensor 1 includes: a thermosensitive element 2 composed of a low-thermal expansion ceramics having a coefficient of linear expansion of 3×10−6/° C. to 5×10−6/° C. and of which electrical s characteristics change depending on temperature; a pair of electrode films 20 provided on the surfaces of the thermosensitive element 2; and a pair of lead wires having a coefficient of linear expansion of 15×10−6/° C. or less and bonded to the electrode films 20. When the coefficients of linear expansion of the thermosensitive element 2, the electrode film 20, and the lead wire 21 are respectively Ta(/° C.), Tb(/° C.), and Td(/° C.), the temperature sensor 1 satisfies a relationship Ta≦Tb≦Td.