To easily obtain a (meth)acryloyl-terminated polymer by reacting a hydroxyl-terminated hydrocarbon polymer having a saturated main polymer chain with an organic halogen compound.

First, a halogen-terminated hydrocarbon polymer obtained by cationic polymerization is reacted with a compound having a protected hydroxyl group and a C=C double bond to obtain a protected-hydroxyl-terminated hydrocarbon polymer having a saturated main polymer chain. Then, the polymer is subjected to the removal of protective groups to obtain a hydroxyl-terminated hydrocarbon polymer having a saturated main polymer chain. The obtained polymer is then reacted with a compound represented by the formula: XC (O)(R)=CH2 (wherein R is hydrogen or a 1-20C organic group; and X is chlorine or bromine). Thus, a hydrocarbon polymer having at least one terminal group represented by the formula: -OC(O)C(R)=CH2 in the molecule can be obtained.