An image forming apparatus includes: a plurality of photosensitive members, an endless belt, and a separation mechanism. The tool has a pair of jaws connected to a pair of pivoting handles, which allow the jaws to be opened and closed. R represents a hydrogen atom or a hydrocarbon group having 1 to 20 carbon atoms, R1 represents a hydrocarbon group having 1 to 20 carbon atoms or the like, R2 to R5 each independently represent an alkyl group having 1 to 4 carbon atoms, an alicyclic hydrocarbon group having 4 to 20 carbon atoms, or the like, and R6 represents a halogen atom or the like.