The present invention relates to a device and a method for sensing (detecting) rear and side areas of construction equipment. The present invention comprises: setting a certain distance from the construction machine (or vehicles) as a safe-distance area (work pattern area); patterning fixed objects within the set safe-distance area; sounding an alarm and/or displaying a captured (or detected) image on a display when other objects excluding the fixed objects that are sensed by the construction machine (that is, the fixed objects that are patterned) are sensed.