POISON singer BRET MICHAELS is suing the Tony Awards for the incident that happened during the 2009 ceremony, when he was hit in the head by a set piece that was being lowered from the ceiling.

(Here's video.)

Bret was hospitalized for a broken nose and a cut lip, but that's not why he's suing.  In the lawsuit, Bret alleges that the accident played a significant role in the near-fatal brain hemorrhage he suffered last year, 10 months after the Tonys.

The suit says, quote, "One of the most common causes of this type of hemorrhage is head trauma, exactly like the one [Bret] suffered at the hands of the Tony Awards."

He says he was not instructed on how to safely leave the stage, and wasn't even aware that anything would be coming down from the ceiling.  The producers have said Bret, quote, "missed his mark."

Bret's lawyer says, quote, "[They] dropped a piece of the stage on Bret's head, and then instead of doing the right thing, joked about it and played it off for ratings.

"Bret never wanted to file a lawsuit, but the Tony Awards have left us with no choice.  They must be held accountable for almost killing Bret, and that is what we are going to do."

He's suing for negligence, civil battery, negligent misrepresentation and negligent interference with prospective economic advantage.  There's no word how much he's asking for.  No one from the Tonys has commented.