To allow miniaturization.

The strain gauge type sensor includes a first flange having four flexible sections, and a second flange having four flexible sections arranged facedly to the first flange. A coupling object formed in the center section of each flexible section of the first flange is coupled to a coupling object formed in the center section of each flexible portion of the second flange. Strain gauges R11-R14, R21-R24, R31-R34, and R41-R44 are fixed to the lower surface of the first flange. Sets of four strain gauges arranged in a straight line, the flexible sections of the first flange, and the flexible sections of the second flange, and the coupling objects are arranged every 90 about the Z axis and at the constant distance from the Z axis.