Modified natural rubber, rubber composition using same, and method for producing modified natural rubber

A modified natural rubber comprising a linking structure represented by the following general formula (C), the linking structure having been formed by allowing polyisoprene, having a structure represented by the following general formula (A) and/or general formula (B), to bind in the structure to an amino group of an amino compound having two or more primary amino groups:

• wherein X represents a hydrogen atom or a methyl group, and Ps, which may be the same or different from each other, represent a polyisoprene unit;
• W-(Q)m (C)
• wherein W represents a residue of the amino compound from which amino end groups are removed, and Q represents at least one selected from the group consisting of the following general formulae (Q-1) to (Q-4), and m represents 2 to 4;
• wherein *1 indicates binding to a carbon atom of a polyisoprene unit, and *2 indicates binding to a carbon atom of the residue represented by W.