A mannequin device for cardiopulmonary resuscitation training, the device comprising: a torso case 102 having an open top and an inner space defined therein; a torso cover 104 constructed to cover the open top of the torso case 102; a head case 106 connected to the torso case 102, wherein the head case has an inner space defined therein and an open top; a head cover 108 constructed to cover the open top of the head case 106; a spring 110 installed on an inner bottom face of the torso case 102 to exert an elastic force to the torso cover to lift the torso cover 104 upward; a first column 112 installed on the inner bottom face of the torso case 102, wherein the first column is provided with a first sensor 112a for sensing a magnetic force; a second column 114 installed on the inner bottom face of the torso case 102, wherein the second column is provided with a second sensor 114a for sensing a magnetic force, wherein the second sensor 114a is installed at a lower height than the first sensor 112a; a pivoting arm 118 installed on the inner bottom face of the torso case 102, wherein the arm 118 has a distal end pivoting in a reciprocating manner in a vertical direction, wherein the arm 118 has a magnet 118a installed at the distal end thereof; and a display 122 installed in the head, wherein the display 122 is configured to display one or more of letters, numbers, and graphics, or to change color, brightness, size, and display area of at least one of the characters, numbers, and graphics; wherein the magnet 118a pivots in a reciprocating manner in a vertical direction by a certain angle between the first column 112 and the second column 114, wherein each of the first sensor 112a and the second sensor 114a is configured to detect a magnetic force when the magnet 118a pivots up and down, wherein the display 122 includes: a depth display 122a indicative of a minimum depth to be depressed during cardiac compression; and a count display 122b indicating a press-rate or count per unit time of currently performed cardiac compressions. a torso case 102 having an open top and an inner space defined therein; a torso cover 104 constructed to cover the open top of the torso case 102; a head case 106 connected to the torso case 102, wherein the head case has an inner space defined therein and an open top; a head cover 108 constructed to cover the open top of the head case 106; a spring 110 installed on an inner bottom face of the torso case 102 to exert an elastic force to the torso cover to lift the torso cover 104 upward; a first column 112 installed on the inner bottom face of the torso case 102, wherein the first column is provided with a first sensor 112a for sensing a magnetic force; a second column 114 installed on the inner bottom face of the torso case 102, wherein the second column is provided with a second sensor 114a for sensing a magnetic force, wherein the second sensor 114a is installed at a lower height than the first sensor 112a; a pivoting arm 118 installed on the inner bottom face of the torso case 102, wherein the arm 118 has a distal end pivoting in a reciprocating manner in a vertical direction, wherein the arm 118 has a magnet 118a installed at the distal end thereof; and a display 122 installed in the head, wherein the display 122 is configured to display one or more of letters, numbers, and graphics, or to change color, brightness, size, and display area of at least one of the characters, numbers, and graphics; wherein the magnet 118a pivots in a reciprocating manner in a vertical direction by a certain angle between the first column 112 and the second column 114, wherein each of the first sensor 112a and the second sensor 114a is configured to detect a magnetic force when the magnet 118a pivots up and down, wherein the display 122 includes: a depth display 122a indicative of a minimum depth to be depressed during cardiac compression; and a count display 122b indicating a press-rate or count per unit time of currently performed cardiac compressions. a depth display 122a indicative of a minimum depth to be depressed during cardiac compression; and a count display 122b indicating a press-rate or count per unit time of currently performed cardiac compressions.