The invention relates to a cross-flow hydraulic turbine including a drive shaft, and drive blades which are connected to the drive shaft (3) by at least one arm (15), wherein: the leading edge (16) of each arm (15) has a symmetrical hydrodynamic profile, the maximum thickness (e) of which is located toward the rear of the profile, at a distance (b), relative to the leading edge, varying between 40% and 80 % of the length (a) of the cord of said profile; the trailing edge of the arm on the internal surface of the associated blade is at the trailing edge of the blade (11) or behind same; and a connection fillet (17) is provided at each arm/blade junction over the entire periphery of the root of the arm, the radius of said fillet being between d and 10d, d being the thickness of the incident limit layer.
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