CCTV footage shows how the wide crater suddenly opened up beneath the man as he strolled down the pavement.
As he dropped into the deep hole, part of the adjoining wall toppled sideways, showering him with rubble.
The victim - an orthopaedic doctor - suffered a broken leg.
Good Samaritans nearby ran over to help the stricken man on yesterday (1 Apr) morning, as reported on Need To Know.
One of them, Geraldo Mussi, recalled: "He arrived, parked his car, went to the hospital to pick up a test, and was on his way back.
"There was a loud noise, and everything fell on him. I went down to grab him, another guy came and helped me lift the stone.
"He was asking for help. The stone on top of him was very heavy.
"We came and helped him, put him in the ambulance, and he was taken to the hospital."
Surgeons operated on the unnamed man after medics found he'd sustained a femur fracture.
Civil Defence workers were sent to the scene in Cachoeiro de Itapemirim, Brazil, to seal off the accident area.
The cause is under investigation, but local officials preliminarily believe the pavement gave way after heavy rains.
Work is ongoing to repair the damage.
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