A bracket for mounting the head rail of a venetian blind to a support surface of a window opening. The head rail is in the form of channel member of U-shaped cross section comprising a base member pivotally mounted to a support surface, a pair of flexible, resilient legs depending from the base member having tangs at their terminal ends engageable with locking beads running the length of the head rail channel and rotatable to a position wherein the tangs release the channel member.