The French embassy in Manila told AFP it was in contact with the local authorities over the death of Jean Marc Messina, 54, his wife and their son, but the cause of death had yet to be confirmed.
The bodies of Messina, his 25-year-old wife Jewelyn Venturillo, and their son Guiliano, 4, were found Wednesday in a pickup truck on a street in Narra, a small town of 65,000 people on Palawan, Filipino police said.
Ramos and the Narra police both told AFP the bodies had been sent to the police laboratory for autopsy and the cause of death was being investigated.
Ramos said the family lived in Puerto Princesa, the provincial capital about 70 kilometres northeast of Narra.
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Locals told police the truck had been parked in the area for several days before the discovery of the bodies, he added.
Many Westerners live on Palawan, one of the country's major tourist draws and famed for its wildlife, white-sand beaches, scuba diving sites and archaeological sites.
"We're still figuring out what happened to the family," Conde told AFP.