Aircraft engine attachment pylon

Attachment pylon (4) for an aircraft engine (2), said pylon comprising a box type rigid structure (10) formed by the assembly of a first spar (18), a second spar (20) at a spacing from the first spar along a vertical direction (Z) of the pylon, two lateral panels (22) and transverse inner ribs (24) connecting said spars and panels (18, 20, 22), said pylon also comprising an aft engine attachment (8) fitted with an aft attachment body (54) arranged outside said box, facing said second spar(20), said aft engine attachment (8) also being fitted with two lateral fittings (26) associated with the two corresponding lateral panels (22) to which they are fixed and from which they project laterally outside said box, each lateral fitting (26) forming a plane attachment interface (36) with said attachment body (54) through which bolts (56) pass,

• characterised in that each attachment interface (36) is in the form of a straight segment inclined at 45° from the vertical direction (Z) as seen in section on any transverse plane of the pylon passing through it, according to which the distance between said attachment interface (36) and said box increases with increasing distance from the first spar (18) towards the second spar (20).