The invention relates to a cardiotocography belt. It has the shape of a spherical cap and comprises at least 19 ultrasonic transducers, called TUS, positioned on a first support layer of elastic material, each TUS being positioned in a support cavity (20), said support cavities (20) being arranged in the following manner in which at least: - five support cavities (20) follow a central line (Lc), - four support cavities (20) follow a first line (L1) parallel to the central line (Lc) - four support cavities ( 20) follow a second line (L2) parallel to the central line (Lc), - three support cavities (20) follow a third line (L3) parallel to the central line (Lc), - three support cavities (20) follow one fourth line (L4) parallel to the center line (Lc). Figure for the abstract: Fig. 1
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