The bench also ruled that Pakistan had violated India's rights to consular visits after his arrest.
The plea involves 'egregious violation of Vienna Convention on Consular Relations 1963 by Pakistan.'
People in Jadhav's native Javli village in Satara district condemned Pakistan and demanded immediate release of the retired Indian Navy officer sentenced to death by a Pakistan army court on alleged 'espionage' charges.
There were cheers of joy and sighs of relief as Judge Abdulqawi Ahmed Yusuf, ICJ president, read out the court's decision.
The Pakistan Foreign Office said that it didn't wish to indulge in a meaningless battle of words" rejected India's baseless "allegations about attitude of authorities during Jadhav's meeting with his wife and mother.
Kulbhushan Jadhav's friends, who have known him since childhood, recall a man tough on the outside but full of compassion inside.
Was the death sentence provoked by a retired Pakistani colonel going missing in Nepal, presumably abducted by Indian agents?
India on Thursday slammed Pakistan for making "absurd" charges of a chip, camera or a recorder being installed in the footwear of the wife of Jadhav.
The MNS -- which aggressively compelled a ban on employing Pakistani actors and others in Bollywood last year -- has been subdued in comparison after a Marathi manoos was sentenced to death in Pakistan.
Salve said it is important to be 'positive' after such a positive ruling.
Yusuf elaborated on several aspects of the Court's ruling in Jadhav's case while presenting his report to the General Assembly.