To provide an inexpensive center of gravity position measuring device for correctly measuring the position of the center of gravity.

The combination of two sensors (a first sensor 5 and a third sensor 7) with two sensors (a second sensor 6 and a fourth sensor 8) is selectively switched one after another by a selecting/switching means to sense the load received by a load receiving board. The output difference among the combinations selected and switched one after another by the selecting/switching means 25 is found by an output difference converting means 14, and the output difference among the combinations found by the output difference converting means 14 is stored in a memory part 23. Then, a first directional position (the position Gy relative to the y axis of coordinates) and a second directional position (the position Gx relative to the x axis of the coordinates) are calculated by a center of gravity position operation part 21 based on the comparison of the output difference among combinations stored in the memory part 23, and the calculated positions are outputted by an output means 24.