It happened in Loughrea Town on the N66 road at just after half past five this morning.
The 28 year old pedestrian was pronounced dead at the scene.
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His body was taken to Portiuncula Hospital where a post mortem will be carried out.
The 19 year old driver of the car was uninjured.
A section of the Loughrea to Galway Road is closed for a garda forensic collision investigation.
Gardai are appealing for witnesses.