MODIFIED NATURAL RUBBER, RUBBER COMPOSITION USING THE RUBBER, AND PNEUMATIC TIRE USING THE COMPOSITION

A modified natural rubber has a branching degree of 0.40 to 0.70 and includes a linking structure represented by formula (C), the linking structure having been formed by allowing polyisoprene, having a structure represented by formula (A) and/or formula (B), to bind in the structure to 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) (C) wherein W represents a residue obtained by removing amino end groups from the amino compound 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 *indicates binding to a carbon atom of a polyisoprene unit, and *indicates binding to a carbon atom of the residue represented by W.