To solve the problems of the danger at the time of the attachment and detachment of cutting blades because both of the cutting blades installed in the right and left directions are present at the same height, and a prescribed position of a straw part not being accurately cut because the cutting performance is reduced by forming a prescribed clearance at the outer periphery parts of both the cutting blades.

Root vegetables raised up by a raising-up device are dug up by a digging-up device, and conveyed rearward by a conveying device to rear upper part while delivering the root vegetables from a neck-arranging conveying device 33 to a tapping conveying device 34 and arranging the necks of the root vegetables. Prescribed positions of leaf parts of the neck-arranged root vegetables are cut by right and left cutting blades 45a and 45b installed in the upper and lower direction so as to be overlapped at a prescribed amount of the outer periphery (A) parts at both the right and left parts in the rear side of the neck-arranging conveying device 33.