The incident took place last night at Rengalbahri village under Gharghoda police station limits.
Shiv Kumar Chauhan, an auto-rickshaw driver, strangulated his second wife Laxmi Chauhan (26) and their 10-month-old daughter, and hanged himself from a tree, a local police officer said.
Chauhan lived with his two wives and children.
Preliminary probe revealed that after returning from Raigarh last night where he had gone to repair his rickshaw, he killed Laxmi and the child when he saw them out on road.
Chauhan often fought with Laxmi suspecting her fidelity, the officer said, adding that further probe was on.