Abstract: The present invention concerns a paint roller comprising a frame having a handle portion and a shaft, a sleeve support rotatably mounted on the shaft for receiving a roller sleeve, and a locking mechanism moveable between a first position in which a paint roller sleeve can be slid over the said support and a second position in which a part of the mechanism is urged against the inside wall of a roller sleeve mounted on the said support in use, whereby to lock the roller sleeve to the frame. The locking mechanism preferably comprises at least one locking element, preferably a resilient element, and first and second axially movable parts which are movable relative to each other to cause the locking element to be urged outwards against the inside wall of a roller sleeve mounted on the support.