A moving amount detection device configured to be incorporated in a moving body, comprising: a plurality of at least three optical sensors having a light source for irradiating a floor surface where the moving body is located, the plurality of optical sensors acquiring image data of the floor surface; a moving amount acquisition unit configured to acquire a moving amount of the moving body in a one-axial or two-axial predetermined coordinate system by using the image data acquired from the optical sensors; and an arithmetic processing unit configured to detect the moving amount of the moving body in a coordinate system of a reference position on the moving body by performing arithmetic processing using the moving amount of the moving body in the predetermined coordinate systems in each of the plurality of optical sensors acquired by the moving amount acquisition unit, wherein the plurality of optical sensors are disposed so that three or more of them are not arranged on the same straight line in a top view of the moving body and the predetermined coordinate systems that are respectively set in the plurality of optical sensors have angles different from each other with respect to the coordinate system in the reference position, and the arithmetic processing unit is configured to detect the moving amount of the moving body in the coordinate system of the reference position by repeatedly performing arithmetic processing of converting the moving amount of the moving body in each of the plurality of optical sensors in the predetermined coordinate systems that are respectively set in the plurality of optical sensors into the moving amount of the moving body in the coordinate system of the reference position and integrating the converted moving amount, wherein the plurality of optical sensors are disposed on a circumference in which the coordinate center of the predetermined coordinate systems that are respectively set in the plurality of optical sensors are centered around the reference position, characterized in that the plurality of optical sensors are disposed so that angles formed by the predetermined coordinate systems respectively set in the plurality of optical sensors and the coordinate system in the reference position are shifted by an angle obtained by dividing 90° by the number of the plurality of optical sensors. a plurality of at least three optical sensors having a light source for irradiating a floor surface where the moving body is located, the plurality of optical sensors acquiring image data of the floor surface; a moving amount acquisition unit configured to acquire a moving amount of the moving body in a one-axial or two-axial predetermined coordinate system by using the image data acquired from the optical sensors; and an arithmetic processing unit configured to detect the moving amount of the moving body in a coordinate system of a reference position on the moving body by performing arithmetic processing using the moving amount of the moving body in the predetermined coordinate systems in each of the plurality of optical sensors acquired by the moving amount acquisition unit, wherein a moving amount acquisition unit configured to acquire a moving amount of the moving body in a one-axial or two-axial predetermined coordinate system by using the image data acquired from the optical sensors; and an arithmetic processing unit configured to detect the moving amount of the moving body in a coordinate system of a reference position on the moving body by performing arithmetic processing using the moving amount of the moving body in the predetermined coordinate systems in each of the plurality of optical sensors acquired by the moving amount acquisition unit, wherein the plurality of optical sensors are disposed so that three or more of them are not arranged on the same straight line in a top view of the moving body and the predetermined coordinate systems that are respectively set in the plurality of optical sensors have angles different from each other with respect to the coordinate system in the reference position, and the arithmetic processing unit is configured to detect the moving amount of the moving body in the coordinate system of the reference position by repeatedly performing arithmetic processing of converting the moving amount of the moving body in each of the plurality of optical sensors in the predetermined coordinate systems that are respectively set in the plurality of optical sensors into the moving amount of the moving body in the coordinate system of the reference position and integrating the converted moving amount, wherein the plurality of optical sensors are disposed on a circumference in which the coordinate center of the predetermined coordinate systems that are respectively set in the plurality of optical sensors are centered around the reference position, characterized in that the plurality of optical sensors are disposed so that angles formed by the predetermined coordinate systems respectively set in the plurality of optical sensors and the coordinate system in the reference position are shifted by an angle obtained by dividing 90° by the number of the plurality of optical sensors.