A vertical motion impeller-type shot peening device, comprising: a housing in which a coil spring is accommodated, the housing including a first chamber with a workpiece port through which the coil spring is put in and put out and a second chamber which performs shot peening to the coil spring; a workpiece holding mechanism including a lower end turn support (84, 85) contacting a lower end turn portion of the coil spring and an upper end turn support (95, 96) contacting an upper end turn portion of the coil spring, the workpiece holding mechanism holding the coil spring to stand between the lower end turn support (84, 85) and the upper end turn support (95, 96) and further including a turntable configured to convey the coil spring in a shot peening position of the second chamber; a stress applying mechanism which compresses the coil spring conveyed into the second chamber between the lower end turn support (84, 85) and the upper end turn support (95, 96); a rotation mechanism which allows the coil spring in the second chamber to rotate around a vertical axis; and a projection mechanism which projects shots toward the coil spring while the coil spring in the second chamber is compressed by the stress applying mechanism and rotated by the rotation mechanism; characterized by an elevator mechanism (58, 59) which moves the projection mechanism vertically between an ascend position (A1, A2) and a descend position (B1, B2) while the coil spring is compressed while gaps between adjacent pairs of turn portions of a wire become less than that in a free state and the shots are projected to the coil spring, the projection mechanism including a first impeller unit which projects shots from a diagonally upward position of the coil spring in the second chamber and moves vertically with respect to the coil spring, and a second impeller unit which projects shots from a diagonally downward position of the coil spring and moves vertically with respect to the coil spring, and the housing including a first hinge mechanism which rotatably supports the first impeller unit in either an open position or a close position with respect to the second chamber, and a second hinge mechanism which rotatably supports the second impeller unit in either an open position or a close position with respect to the second chamber. a housing in which a coil spring is accommodated, the housing including a first chamber with a workpiece port through which the coil spring is put in and put out and a second chamber which performs shot peening to the coil spring; a workpiece holding mechanism including a lower end turn support (84, 85) contacting a lower end turn portion of the coil spring and an upper end turn support (95, 96) contacting an upper end turn portion of the coil spring, the workpiece holding mechanism holding the coil spring to stand between the lower end turn support (84, 85) and the upper end turn support (95, 96) and further including a turntable configured to convey the coil spring in a shot peening position of the second chamber; a stress applying mechanism which compresses the coil spring conveyed into the second chamber between the lower end turn support (84, 85) and the upper end turn support (95, 96); a rotation mechanism which allows the coil spring in the second chamber to rotate around a vertical axis; and a projection mechanism which projects shots toward the coil spring while the coil spring in the second chamber is compressed by the stress applying mechanism and rotated by the rotation mechanism; characterized by an elevator mechanism (58, 59) which moves the projection mechanism vertically between an ascend position (A1, A2) and a descend position (B1, B2) while the coil spring is compressed while gaps between adjacent pairs of turn portions of a wire become less than that in a free state and the shots are projected to the coil spring, the projection mechanism including a first impeller unit which projects shots from a diagonally upward position of the coil spring in the second chamber and moves vertically with respect to the coil spring, and a second impeller unit which projects shots from a diagonally downward position of the coil spring and moves vertically with respect to the coil spring, and the housing including a first hinge mechanism which rotatably supports the first impeller unit in either an open position or a close position with respect to the second chamber, and a second hinge mechanism which rotatably supports the second impeller unit in either an open position or a close position with respect to the second chamber.