The blast came despite tight security across Sri Lanka on the eve of the 60th independence day celebrations scheduled for Monday.
The victims of Sunday's blast were rushed to Colombo National Hospital, where doctors said seven people were dead on admission. Hospital spokeswoman Pushpa Soysa said another 97 people were being treated for injuries.
"The bombing has all the hallmarks of the Tigers," a police officer at the scene said. "The head of the woman suicide bomber was found on a platform.
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There was no immediate claim of responsibility for the blast.
Earlier Sunday, at least six visitors to a zoo on the outskirts of Colombo were wounded in a hand grenade attack.
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Police had sought public assistance to stem a wave of bombings in the country after a blast Saturday aboard a crowded bus in the north-central town of Dambulla killed 20 people