Patent ID: 8367765

Claim:
A conjugated diene-based polymer having a monomer unit based on a conjugated diene, a monomer unit based on a compound represented by the following formula (1) and a monomer unit based on a compound represented by the following formula (2); wherein R 11 represents a hydrogen atom or a hydrocarbyl group, m is an integer of 0 or 1, R 12 represents a hydrocarbylene group, and X 1 , X 2 and X 3 each independently represent a substituted amino group, or a hydrocarbyl group optionally having a substituent, provided that at least one of X 1 , X 2 and X 3 is a substituted amino group; wherein R 21 represents a hydrogen atom or a hydrocarbyl group, n is an integer of 0 or 1, R 22 represents a hydrocarbylene group, and A represents a substituted amino group, or a nitrogen-containing heterocyclic group.