The mass funeral was held at the St Sebastian's church in Negombo, north of Colombo, which was one of the places targeted in Sunday's blasts, reports the BBC.
Earlier, a moment of silence was observed at 8.30 a.m., reflecting the time the first of six bombs detonated.
Flags were lowered to half mast and people bowed their heads in silence in respect to the victims as well as the 500 people injured in the attacks, BBC said.
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The funeral comes amid a state of emergency which was imposed on Monday.
The police have so far detained 40 suspects in connection with the attacks, a spokesman said on Tuesday.
The government has blamed a local Islamist group for the carnage.
The Foreign Ministry said it had identified 31 foreign nationals among the dead, including 10 Indians, while 14 others remained unaccounted for.