Abstract: An oar includes a blade portion, a loom including a grip, and a connecting member for connecting the blade portion and the loom together. The blade portion includes a frame and two blades. The frame includes two parallel vertical plates, a front plate, a top plate, a bottom plate and an open rear side defined by the vertical plates, the top plate and the bottom plate. A rectangular slot is formed between each blade and the front plate. A protrusion is formed on a top edge and a bottom edge of each blade. The blades are pivotally restrained in the rectangular slots with the protrusions engaging with corresponding holes formed on the top plate and bottom plate of the frame.