To provide an apparatus for preventing a soil conditioner from scattering which is resistant to breakage even if a shock is applied by a flexible container bag and easy to replace a rubber band, and a soil improvement machine including the same.

The apparatus 11 for preventing the soil conditioner from scattering prevents the soil conditioner from scattering around by the flexible container bag 27 broken by a breaking tool 25 when the bag 27 filled with the conditioner is cast into a hopper 4. The periphery of a canvas 14 is fixedly glued to an opening rim of a canvas mounting frame 12 with an opening structure to be placed on an upper part of the hopper 4. A polygonal or circular ring 17 is fixed to the opening at the center of the canvas 14. The apparatus includes a plurality of rubber bands 23 attached between the ring 17 and the frame 12 to support the ring 17.