PROBLEM TO BE SOLVED: To solve the problem in which there is no stability since a jack is inclined when a pedestal frame extends and contracts with respect to a connection frame and a body frame in a structure which has the connection frame and the pedestal frame provided so as to be freely inserted and removed to/from the body frame hung down from the connection frame and in which the jack extends and contracts with bringing up and down of a leg frame (extension and contraction of the pedestal frame), the jack being provided in the leg frame of a travelling machine unit.SOLUTION: A tea field management apparatus consists of a leg frame of a crawler, and a gate-shaped frame provided with a beam part provided in the leg frame and a leg support part. A support arm provided in the leg support part maintains separation and pressure contact relationship with the ground surface and supports the tea field management apparatus. The tea field management apparatus has a structure in which: (1) the support arm is separated from the ground surface when the length between the lower end of the leg frame and the lower end of the leg support part is a prescribed length and (2) the support arm is brought into pressure contact with the ground surface when the length of the lower end of the leg frame and the lower end of the leg support part is shorter than the prescribed length.
