Mehmet Soysal was on the phone in a hill in Bodrum, in the southwest of Turkey, when he spotted the pram flying towards the 50ft drop.
Captured on CCTV footage, the fisherman is seen dropping his phone and rushing to grab hold of the pram.
The two-year-old boy, Ali Ceyhan, is propelled out of the chair and onto the tarmac just meters from the cliff's edge.
Consequently, Mr Soysal runs over to pick up the toddler as stunned passers-by watch.
Ali's mother said “I turned round to show my husband something and I had taken my hands off the pram for just a second.”
“I can't thank enough the man who saved my son. He is a hero.”
Shop owner Mumtaz Nas said it all happened so fast stating that he was chatting with his friend as the man walked towards them.
“Suddenly he turned round and the next thing I knew a pram appeared out of nowhere.”
“We ran over and luckily the boy was fine, but we called an ambulance anyway,” he said.
A hospital spokesman noted that the boy did not sustain injuries, pointing out that he is lucky.