A process for producing a norbornene derivative having an organosilyl group suitable as a synthetic intermediate for pesticides and medicaments and for production of polyolefin polymers, particularly polyolefin polymers having a good adhesiveness with metals or insulating inorganic materials in high yields with a satisfactory purity. A process for producing a norbornene derivative having an organosilyl group represented by the general formula (3): wherein R each represents an alkyl group or an aryl group, R′ represents an alkyl group or an aryl group, n represents an integer of 0 to 2 and m represents an integer of 0 or more, which comprises reacting a compound represented by the general formula (1): wherein R, n and m have the same meanings as above, and X represents a halogen atom, with a Grignard agent represented by the general formula (2): R′MgCl  (2) wherein R′ has the same meaning as above.