PURPOSE: To provide a suction fixture which can surely detect a surface to be cleaned by allowing an operating plate which is projected out of the bottom section of a suction main body in such a way as to freely appear frequently, to be furnished with a detecting means detecting pressure subjected to the surface, to be cleaned.

CONSTITUTION: A box shaped floor surface sensor 17 which is disposed at an engaging hole 16 at the bottom section of a sensor housing chamber 15, is made of a lower case 18, an intermediate case 19, and of an upper case 20, and the projected hole 21 at the bottom section of the lower case 18 allows an operating plate 22 to be projected in such a way as to freely appear frequently. In addition, a pressure sensitive conductor 41 is projected to the inside of the hole 23 of the intermediate case 19 so as to be held, and when a float 36 is raised with the operating plate 22 pushed upward by means of the cleaned surface, the pressure sensitive conductor 41 is pressed by the flat section 37 of the float 36. By this constitution, damage owing to shock can thereby be prevented with no pressure sensitive conductor exposed out of the suction main body, and wear due to friction with the surface to be cleaned is thereby eliminated.