1. An object sensing device, comprising: an image capture unit that captures surroundings of a host vehicle; and a processing device that executes a sensing process of an object to be sensed from an image captured by the image capture unit, wherein the processing device comprises: a scene analysis unit that analyzes a travel scene of the host vehicle; a process priority change unit that changes a sensing process priority of the object to be sensed based on the travel scene analyzed by the scene analysis unit; and an object-to-be-sensed sensing unit that senses the object to be sensed based on the sensing process priority changed by the process priority change unit.