To provide a compact and low-cost kinesimeter which can be easily assembled, and which can detect two-dimensional motion by applying an inclination detector on the market to a motion signal generating part.

An input circuit 2 of an inclination detector 1 is connected to a counting circuit 3, and the input circuit 2 and the counting circuit 3 are connected to an MPU 5 through an input/output port 4. In installing the inclination detector 1 onto the kinesimeter, it is installed to be inclined for an angle of 45°, and a contact electrode 12 on the outside of a case 11 is connected between a load resistance R and the ground to cross them. The input circuit 2 is composed of a CR integrating circuit or flip-flop latch circuit, so effects of chattering generated when a contact ball 13 gets in contact with/apart from the contact electrode 12 are eliminated. The counting circuit 3 counts input pulses generated by on/off of a contact switch composed of the contact electrode 12 after a chattering process and the contact ball 13. A counter is reset by a control signal from the MPU 5.