About 4.50pm, a blue 2006 Audi SUV and a white BMW motorcycle collided at the intersection of Scarborough Beach Road and Grant Street.
Emergency services attended the scene.
The 61-year-old male motorcyclist was conveyed to Royal Perth Hospital for treatment of critical injuries sustained.
The 61-year-old male driver of the Audi was not injured.
Major Crash investigators are conducting an examination of the scene and are appealing for any witnesses to contact Crime Stoppers online via www.crimestopperswa.com.au or by calling 1800 333 000.
Dash-cam or mobile phone vision relating to this crash can be uploaded directly to investigators via this link: https://wapf.au.evidence.com/axon/community-request/public/seriouscrash… ;
If you or anyone you know has been affected by a road crash, contact Road Trauma Support WA on 1300 004 814.
The WA Police Force continues to urge all motorists to take care on the road. Drive safely and keep in mind the wellbeing of yourself and others.