PURPOSE: To improve durability against rapid rotation by arranging a means for converting a sensor output signal into a digital signal on the rotation side, sending the digital signal to a light emitting element group arranged on the outer periphery of a cylindrical case on the rotation side to emit respective light emitting elements, reading out the light emission on the fixed side to convert it to a numerical value, displaying and recording the read contents.

CONSTITUTION: An output signal from a sensor 13 arranged on the rotation side is converted into a digital signal by an A/D conversion part 3B formed on an electric substrate using a photocell 6 as a power supply and the light emitting element group 5 arranged on the outer periphery of the cylinder case arranged on the center of rotation is emitted in accordance with a sent signal. Light emitted from the group 5 is received by a photosensor group 8 arranged on the fixed side as an electric signal, the electric signal is converted to a numerical value by a reader 11 and the numeral data are displayed on a displaying/recording circuit 12. Thus the noncontact type signal transmitting equipment can endure rapid rotation.