A boom for a boardsailing is formed of two bodies, intermediate pipes, end pipes, a front coupler and a rear coupler. The bodies and pipes are non-metallic synthetic resin pipe reinforced by fiber layers, including a synthetic fiber layer and at least one carbon fiber layer. The portions of said bodies, intermediate pipes and end pipes which are used for interconnecting with the couplers and with each other are further reinforced by a reinforcing synthetic resin layer which is reinforced by a reinforcing fiber layer. The reinforcing fiber layer includes fine fibers oriented in at least two mutually different directions and having diameters of 20 mu m or less.
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