The bomber was killed when he rammed his vehicle into the convoy; one French soldier sustained minor injuries.
No one has claimed responsibility for the attack.
Earlier this month, a French soldier died in a clash with suspected Taliban rebels in Kandahar.
In other news, an Afghan government official, Yousuf Stanizai, said two policemen were killed in a clash with insurgents in Kandahar province late on March 18. Four other officers are missing. Two suspected Taliban fighters were also killed.