A jury has found a Paraparaumu man guilty of beating up his stepdaughter's rapist.

The jury of 11 women and one man has delivered the verdict in the Wellington District Court this afternoon after a few hours of deliberation.

The trial has been going since last week.

The man, who cannot be named to protect his stepdaughter, was charged with assault with intent to injure after he spotted Jason Haward walking down the street two days after raping the man's stepdaughter.

He got out of a car and attacked Haward, punching him in the face as witnesses tried to intervene.