Three of those convicted were Kuwaiti citizens, according to the court ruling.
The court ordered that the remaining two, who were foreigners, be deported after serving the jail term. Their nationalities were not immediately clear.
Kuwait court sentences 7 to death for Shia mosque bombing
It also acquitted two others.
The men were charged with raising about 400,000 Kuwaiti dinars ($1.3 million) and transferring the funds to IS, which has seized control of large parts of Syria and Iraq and carried out attacks throughout the Middle East.
Kuwait mosque attack suspect admits being in Islamic State
Over the past year, Kuwaiti courts have issued several rulings against IS supporters.
In September, a lower court sentenced seven people, including five in absentia, to death for helping a Saudi suicide bomber carry out an attack on a Shia mosque in Kuwait that killed 26 worshippers and wounded hundreds.
COMMENTS
Comments are moderated and generally will be posted if they are on-topic and not abusive.
For more information, please see our Comments FAQ