The accused was arrested today, the police said.
A quarrel broke out between the brothers on Saturday night at their rented house in Pandapara when the younger brother allegedly struck his elder brother's head with an iron rod, a police officer said.
The elder brother's body was recovered from their house on today morning, the officer said.
They used to quarrel often, the landlord, Partha Majumdar said in his statement, he said.
The motive behind the killing is yet to be ascertained, the officer added.