To provide an establishment method of a press-in continuous wall with which a continuous wall can be constructed efficiently and at a low cost.

A continuous wall is constructed by forming a plurality of pile bodies Gp while using a pile press-in device 10, then inserting a bag-shaped elastic body S1 into a hole which is drilled to spread over neighboring pile bodies Gp, further, pressurizing and filling the bag-shaped elastic body S1 with fillers S2, and forming a cut-off body S in tight contact with the pile bodies Gp at both sides.