The in situ high-pressure measurements of electrical resistivity versus temperature for weak ferromagnetic BaIrO3 have been performed, using a Cu-Be piston-cylinder-type apparatus up to 1.0 GPa at 80-300 K. The electrical resistivity is increasing with pressure. The pressure derivative of Curie temperature partial derivative T-c/partial derivative P is equal to -6.1(2) K/GPa, and the relative pressure dependence partial derivative In T-c/partial derivative P is equal to -3.4(1)/GPa, which indicates that BaIrO3 is a weak itinerant ferromagnet.
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