PURPOSE: To provide a data input device which consists of only an electric circuit with no mechanical working part included and can input the data with no contact loss.

CONSTITUTION: An input part 1 contains the acceleration sensors 2, 3 and 4 which detect the acceleration in the different directions. A data converter 7 converts the fetched signals into the digital data that can be treated by a computer. Then the converter 7 amplifies the detection signals of the sensors 2-4, integrates these amplified signals through the integrators 11-16 set in two stages, and converts these integrated signals into the digital signals through the A/D converters 17 and 18. These digital signals are transferred to a computer 25 via the buffers 20-23 and a data line 24.