Abstract: An apparatus for and a method of shoring a trench. The apparatus includes two vertical posts which are adapted to be disposed at the borders of the trench in an opposite relation and a rigid frame which is locatable at and vertically movable along the posts and which is secured within the posts. Laterally, the posts have receptacles for shoring plates adapted to be disposed in the longitudinal direction of the trench. The posts with the shoring plates and the frame can be lowered successively to the corresponding working depth by the reinsertion of bolts at the posts which serve for holding the frame.