A sun tracker (1) is provided with at least one solar radiation collector (2) supported by a corresponding device (3) designed to orient it in space in relation to a fixed reference system. The device (3) includes three rigid members (4,5,6) arranged in sequence and two rotary couplings (7,8) connecting the rigid members (4,5,6) in pairs and having rotation axes (9,10) angled at 90 degrees to one another. The tracker (1) comprises stepper motors (12) for driving rotation of the rigid members (4,5,6) about the axes (9,10) of the couplings (7,8); and control means (13) for activating the controlled movement of the rigid members (4,5,6), to orient the solar radiation collector (2).
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