A rotorcraft equipped with a fuel feed unit for a power plant of the rotorcraft comprising at least one combustion engine (13a, 13b), the rotorcraft comprising a fuselage extending longitudinally between the front and the rear of the rotorcraft and formed of stiffening elements for stiffening a covering, comprising at least: -) a longitudinal succession of transverse frames (9a- 9f; 10a, 10b) locally delimiting the transverse profile of the fuselage and the longitudinal stiffeners (11a, 11b) of the covering, and -) an upper floor securely engaged with at least two of said frames, referred to as median frames (9a, 9b), forming part of a median section of the fuselage located between a cockpit and a tail boom, said upper floor bearing at least one main rotor with a substantially vertical axis providing at least the lift of the rotorcraft, said fuel feed unit comprising at least one feed assembly for feeding fuel to an engine (13a, 13b) of the power plant, said at least one fuel feed assembly comprising at least: -) a fuel tank (25, 26) installed within at least one lower compartment of the fuselage located beneath a separating median floor between the lower compartment and at least one upper compartment forming a habitable space of the rotorcraft, -) a feeder (28a, 28b) immersed in the tank (25, 26), said feeder (28a, 28b) being equipped at least with a supply circuit (34a, 34b) for supplying fuel from the tank (25, 26) and being equipped with a feed circuit (24a, 24b) for feeding the engine (13a, 13b) with fuel from the feeder (28a, 28b) to the engine (13a, 13b) with which the fuel feed assembly is associated, characterised in that said median floor is a load-bearing floor mounted securely engaged with at least the two said median frames (9a, 9b), the lower compartment being devoid of said covering on the lower face of the fuselage which is open towards the outside by providing an opening in the lower compartment towards the outside of the fuselage, the tank (25, 26) being held suspended from the lower face of the median floor which forms a member for anchoring the tank (25, 26) by suspension, the tank (25, 26) being accessible from the outside of the fuselage via said opening. -) a longitudinal succession of transverse frames (9a- 9f; 10a, 10b) locally delimiting the transverse profile of the fuselage and the longitudinal stiffeners (11a, 11b) of the covering, and -) an upper floor securely engaged with at least two of said frames, referred to as median frames (9a, 9b), forming part of a median section of the fuselage located between a cockpit and a tail boom, said upper floor bearing at least one main rotor with a substantially vertical axis providing at least the lift of the rotorcraft, -) a fuel tank (25, 26) installed within at least one lower compartment of the fuselage located beneath a separating median floor between the lower compartment and at least one upper compartment forming a habitable space of the rotorcraft, -) a feeder (28a, 28b) immersed in the tank (25, 26), said feeder (28a, 28b) being equipped at least with a supply circuit (34a, 34b) for supplying fuel from the tank (25, 26) and being equipped with a feed circuit (24a, 24b) for feeding the engine (13a, 13b) with fuel from the feeder (28a, 28b) to the engine (13a, 13b) with which the fuel feed assembly is associated,