PROBLEM TO BE SOLVED: To provide a trench excavator capable of preventing an excavated groove from being closed by excavated soil, not worsening a drainage property, and keeping a drainage function of the excavated groove reliably.SOLUTION: A trench excavator includes: a stabilization member 22 in a machine frame 3, the stabilization member capable of contacting slidably field upper edge faces W, Wand in-groove side faces W, Wforming both right/left upper corner edge parts of an excavated groove W excavated by a raking member 11 and a drop prevention member 26 in the stabilization member, the drop prevention member preventing drop of excavated soil D laterally discharged by the raking member into the excavated groove.SELECTED DRAWING: Figure 5
