Provided is a rubber composition that, when adopted in a tire member such as a tread, displays low heat generation, high abrasion resistance, and high cut resistance, and enables excellent fatigue cracking resistance to be realized. The rubber composition contains carbon black that satisfies relationship formulae (1) to (3), shown below. 62.5×24M4DBP+hydrogen amount of carbon black≦8337.5   (1) 24M4DBP−0.25×CTAB≧62.5   (2) Dst+0.75×ΔD50≧152.5   (3)