The accused, Deepa Ram, yesterday took his two wives Daria Devi (25) and Mali Devi (27) in his car on the pretext of buying them jewellery, the police said.
Ram claimed that he was unhappy with them due to some family matters and as they did not keep his mother happy, Additional SP Jalore Binja Ram said.
"In the moving car, he quarrelled with them. As the car lost balance, he stopped," Binja Ram said.
Meanwhile, one of his wives got out of the car seeking help of locals but he managed to push her inside and drove away again, the police said.
The accused works as a labourer in Gujarat and is father of three children.
He has confessed the crime and was arrested, the police said.