Electronic control device and management method of object

A management method of an object observed by an electronic control device, the management method, wherein

• the electronic control device includes an arithmetic device that executes a program and a storage device that the arithmetic device can access,
• the management method of the object includes
• an object recognition procedure in which the arithmetic device recognizes surrounding objects based on external environment information acquired by an external environment sensor,
• an obstacle object generation procedure in which the arithmetic device generates an obstacle object regarding an object that generates a blind spot region by shielding observation by the external environment sensor among the recognized objects,
• a blind spot object management procedure in which the arithmetic device manages, as a blind spot object, a blind spot region generated by the obstacle object, and
• a solid object generation procedure in which the arithmetic device generates solid object information regarding an object that can enter and exit the blind spot region among the recognized objects, and
• in the blind spot object management procedure, the arithmetic device associates a solid object that has entered the blind spot region with a blind spot object in the blind spot region, and cancels association of a solid object that has exited the blind spot region with a blind spot object in the blind spot region.