A pelvis assembly for a dummy includes a pelvic plate attached to a lumbar region of the dummy, and one of more pelvic units, attached to the pelvic plate to transmit motion from a femur bar of the dummy to the plate. Each pelvic unit includes a hip joint, attached to the femur bar; a rotary axle, a first end of which is attached to the hip joint, and which is disposed laterally, to rotate together with the hip joint when the femur bar pivots vertically; and one or more pelvic angle adjusters, installed near a second end of the rotary axle, to transmit rotation of the rotary axle to the pelvic plate, thereby changing a vertical angle of the pelvic plate.