The latest 5 million customers were added in just 18 months after the declaration of 10 million customer milestone in July, 2012, the company said in a statement.
HMSI attributed its growth to foray in the mass motorcycle segment - Dream Yuga and Dream Neo, which has found acceptance in the market.
Commenting on the feat, HMSI Vice President, Sales & Marketing Y S Guleria said: "Achieving the 15 million customers mark in such a short period is a testimony to growing customer trust on Honda brand. To meet customer demand and reach out to new markets, Honda has intensified its efforts to rapidly expand its network by adding 500 new touch-points and take its growing network to 2,500."
The company competes dierectly with Honda's erstwhile partners Hero MotoCorp, Bajaj Auto and TVS Motor Co.
