PROBLEM TO BE SOLVED: To provide a ridge forming machine capable of easily performing a ridge forming operation and a ridge digging operation for adjusting a ridge width without using a dedicated machine.SOLUTION: A ridge forming machine includes a soil banking part that can be switched between: a state of casting up dug soil on a ridge side to bank up the soil on a ridge forming position and a state of discharging the dug soil in a direction away from the ridge. Further, in the ridge forming machine, the soil banking part includes a rotor part having a plurality of digging claws radially arranged on a rotation shaft thereof for digging the soil, and a digging depth of the rotor part and a relative height of a rotation center of a conical disc of a ridge forming part are variable.
