To provide a hopper, capable of securely preventing generation of a bridge phenomenon in a hopper even when material charged into the hopper has a relatively high viscosity, and a soil improving machine provided with that.

This hopper 4 is provided with a material receiving part 30 to receive material soil 3, composed of side plates 34' and 34 disposed on the right and the left at least, and a chute part 31 to feed the material soil 3 received into the material receiving part 30 downward. A gap is provided between base parts 38' and 38 of the side plates 34' and 34 and an upper end of the chute part 31, and oscillating mechanisms 42' and 42 are provided to oscillate the side plates 34' and 34.

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