The invention describes a temperature sensor for a
resistance thermometer comprisingan electric measuring
resistor (3) the resistance material of which consists either of a
ceramic material or of a metallic resistance material in combination with a
ceramic or a mineral carrier,a protective tube (2) comprising a closed tip (2b) and a rear end that provides an access to the inner space of the protective tube (2) and that contains the measuring
resistor (3) closely adjacent the closed tip (2b) of the protective tube (2),at least one supply line (5) that is brought out through the rear end of the protective tube (2),and an electrically insulating filler (6) based on a
ceramic or a mineral material that fills the space between the protective tube (2) on the one side and the measuring
resistor (3) and its at least one supply line (4, 5) on the other side. It is provided according to the invention that the packing density of the filler (6) has a gradient in lengthwise direction of the protective tube (2).