Provided is an art of making a tilling depth of a rotary constant, in a front rotary type tiller. A tiller (10) has a driving wheel (13) supported by a machine body (12), and having a rotary (14) that tills soil (21), in front of the driving wheel (13), the tiller (10) further has a tilling depth stabilizing apparatus (20) that is located behind the driving wheel (13), and the tilling depth stabilizing apparatus (20) includes a contact portion (40) capable of contacting a top surface of the soil (21) and capable of sliding on the top surface, and a height adjusting device (28) that adjusts a height of the contact portion (40) relative to the driving wheel (13).
