To provide a liquid face level adjusting apparatus capable of preventing insanitation in pinhole of a float caused by friction or the like from occurring, and simplifying a periodical operation such as disassembling, cleaning and assembling for a flow quantity adjusting apparatus.

The liquid face level adjusting apparatus is such an apparatus that adjusts the liquid face level L so that a liquid food is filled at a specified level in a tube, in a packaging and filling machine wherein a web-like packaging material 1 is molded into a tubular shape, longitudinal seal is performed in the longitudinal direction of the tube on both end parts of the packaging material, and the liquid food at a low temperature is filled into a tubular packaging material from a filling pipe. The liquid face level adjusting apparatus is characterized in that a heating means 42 for heating the inner surface of the web-like packaging material, and for raising the temperature of the outer surface of the web-like packaging material, and being the surface to be measured, detecting instruments 44a, 44b, 44c, 44d and 44e for detecting the temperature of the surface to be measured from the outside of the tubular packaging material, and a controlling means 45 for controlling the flow quantity in a filling pipe from an output signal of the detecting instrument, are equipped.