He might be staring down the barrel of retirement, but Reggie Bush is making it clear -- he ain't worried about money -- 'cause he just bought his mom a brand new $200,000 Bentley.
Reggie's mom just turned the big 50 -- and to celebrate, the injured 49ers running back hooked her up with the keys to a sick Bentley Flying Spur ... which (depending on the options) can cost up to $250k.
Bush has reportedly made more than $60 MILLION during his NFL career -- not counting all of the endorsement $$$ he's racked up. Plus, he's planning on suing the city of St. Louis for a TON of cash over the knee injury he suffered there earlier this season.
Bottom line ... his knee may be hurting (you can see the brace in the pic), but his wallet sure as hell ain't.