PURPOSE: To attain a 2-dimensional displacement performance matching with the human sense by providing an operation panel on an axis Z freely and rockingly and in parallel with a base board and also holding a pressure-sensitive resistance sensor with the center point of installation of the sensor defined as an imaginary axial point of the axis Z so that the pressure-sensitive resistance sensor is held therebetween.

CONSTITUTION: Two pairs of pressure-sensitive resistance sensors V1 - V4 are equidistantly provided on the basis of the imaginary axes X and Y of a substrate. These resistance sensors transform the degrees of pressure into the levels of electric resistance. Then an operation panel O is provided freely and rockingly on the axis Z and in parallel to the substrate with the center point of installation of sensors V1 - V4 defined as the axial point of the axis Z. At the same time, the panel O holes the sensors V1 - V4 therebetween. Thus, these sensors can be moved obliquely at the speed equal to that set in the XY direction and therefore a 2-dimensional displacement action is easily attained in accordance with the human sense.