1. A vehicle collision object discriminating apparatus comprising: a front surface side sensor and a reverse surface side sensor which are respectively disposed at front and reverse sides of a cushioning member with respect to a collision direction of a vehicle body for generating an output signal representing an impact force entered when the vehicle body collides with a collision object, and a discriminating section for discriminating the type of the collision object based on output signals of said front and reverse surface sensors, wherein said discriminating section discriminates the type of said collision object based on an ON duration time or an ON time difference as well as a combination of output levels of said two sensors, said ON duration time representing a period of time during which at least one of said two sensors continuously produces an ON-level output, said ON time difference representing a period of time from ON-level output by one of said two sensors to ON-level output by the other of said two sensors.