An emergency stop device of an elevator comprising: an elevating/lowering body; a guide rail erected in an elevator shaft to guide the elevation/lowering of the elevating/lowering body; a pressing assembly including a pressing piece that is provided on the elevating/lowering body and is formed with a pressing surface which faces to the guide rail and the upper side of which tilts to the guide rail side; and a braking wedge piece that is in sliding contact with the pressing surface of the pressing piece and is inserted under pressure between the guide rail and the pressing surface of the pressing piece at the time of emergency stop operation to brake the lowering of the elevating/lowering body; characterised by said pressing assembly including: said pressing piece that is movable and formed with the pressing surface and is provided so as to be displaceable to the right and left direction; and a cam that is disposed between the movable pressing piece and a fixed portion on the anti-guide rail side of the movable pressing piece, holds the movable pressing piece so that the braking wedge piece and the guide rail are separate from each other at the normal time, and rotates at the time of emergency stop operation to move the movable pressing piece horizontally to the guide rail side, whereby the braking wedge piece is pressed on the guide rail. an elevating/lowering body; a guide rail erected in an elevator shaft to guide the elevation/lowering of the elevating/lowering body; a pressing assembly including a pressing piece that is provided on the elevating/lowering body and is formed with a pressing surface which faces to the guide rail and the upper side of which tilts to the guide rail side; and a braking wedge piece that is in sliding contact with the pressing surface of the pressing piece and is inserted under pressure between the guide rail and the pressing surface of the pressing piece at the time of emergency stop operation to brake the lowering of the elevating/lowering body; characterised by said pressing assembly including: said pressing piece that is movable and formed with the pressing surface and is provided so as to be displaceable to the right and left direction; and a cam that is disposed between the movable pressing piece and a fixed portion on the anti-guide rail side of the movable pressing piece, holds the movable pressing piece so that the braking wedge piece and the guide rail are separate from each other at the normal time, and rotates at the time of emergency stop operation to move the movable pressing piece horizontally to the guide rail side, whereby the braking wedge piece is pressed on the guide rail. said pressing piece that is movable and formed with the pressing surface and is provided so as to be displaceable to the right and left direction; and a cam that is disposed between the movable pressing piece and a fixed portion on the anti-guide rail side of the movable pressing piece, holds the movable pressing piece so that the braking wedge piece and the guide rail are separate from each other at the normal time, and rotates at the time of emergency stop operation to move the movable pressing piece horizontally to the guide rail side, whereby the braking wedge piece is pressed on the guide rail.