A boat cover support has a disc member placed against the cover. A vertical strut is received in a socket extending downward from the disc member. The socket has two opposed, semicircular walls to receive a circular strut. The ends of the socket walls are integral with the recesses. The ends of the socket walls are spaced apart to form a transverse notch through the socket to receive a rectangular strut. The disc member has slots arrayed in groups of three around the periphery. Straps extending from the slots outward are attached to the boat structure to stabilize the cover support. The disc member has four recesses with walls extending downward to reinforce the disc member and the socket. Lines extending from the recesses outward are attached to the boat structure to stabilize the cover support. Each recess has an interior cavity to receive a terminal knot in the line so as not to abrade the boat cover. A step is placed against the boat sole, to prevent the strut from slipping transversely.