In the connecting groups (8) and (9), (R3)u and (R4)z each are a group connecting a silicon atom in the silicone chain to the phenylene group of the oxyphenylene group contained in the connecting group of the invention; R3 and R4 each are preferably an alkylene or alkenylene group having 1 to 16 carbons, particularly preferably having 1 to 12 carbons; and examples thereof include ethylene, propyle