PURPOSE: To enable easy detection of a contact position of a body, by allowing No.1 and No.2 conductive fibrous structure bodies to contact each other tightly and measuring change of electric resistance between said 2 sheets of conductive fibrous structure bodies.

CONSTITUTION: A plane contact sensor is of a construction that on both surfaces of pressure sensitive conductive rubber sheet 1 a conductive fibrous structure bodies 9 and 10 are jointed and on the outside surfaces of them, protective sheets 11 and 12 are adhered for prevention of damages. Further, with the bodies 9, 10, lead wires 5, 6 are connected by means of soldering, screwing, etc., and when a part of this kind of plane contact assembly is pressed by a force acting in the vertical direction of the plane, an electric resistance of a part of the pressure sensitive rubber sheet drops, bringing the bodies 9 and 10 into a conductive contact. Connection of the wires 5 and 6 to an electronic circuit and measurement of the change of the resistance, permit detection of this occurrence, regardless of the location of contact of other body with a corrected part.