A cardiopulmonary resuscitation support device (10) for assisting a rescuer with cardiopulmonary resuscitation using chest compressions, including: a pressure detecting device (12) provided with a pressure sensor (16) including a pressure sensing part (40) which is configured to be overlapped on a chest, the pressure sensing part (40) having a sheet form and being capable of flexural deformation in a flexible manner; and a displacement detecting device (14) provided with a displacement sensor (64) to detect a displacement of a hand of the rescuer compressing the chest, the displacement detecting device (14) being configured to be retained by the hand of the rescuer at a part away from a chest compression surface.