Turbomachine blade, compromising a root with reduced stress concentrations

A turbomachine blade comprises airfoil 4 and root, the root including platform 10 and flange 11 through which bolt holes 26 are formed, all forming a single piece. The airfoil comprises an edge 31 connected to the platform at a point 32 axially between the end 34 of the platform and at least one face of the bolting flange facing said end. The root further comprises a groove (18, fig. 3) extending from said end between the platform and flange, penetrating in an axial direction towards a bottom 21 located beyond both the connection point and the entire flange. The flange is connected to the platform by neck 23 delimited by a face 19 of the groove and extending axially to a heel 22, the neck having a thickness less than the minimum thickness 24 of the flange. The edge may be a trailing edge of the blade, and the blade may be a fixed blade. The flange may have a thinned central portion 25 between conical bearing surfaces 27, 28. The groove reduces stress concentrations in the blade root by eliminating direct communication between the airfoil connection point and the flange.